Loaded M&M Oreo Cookie Bars

If you like Oreos and M&Ms, these are the bars for you.

Is there anyone who doesn’t like Oreos and M&Ms? I hope not. Or you may be reading the wrong blog.

Loaded M&M Oreo Cookie Bars - Stuffed to the max with M&Ms and Oreos! Easy, no-mixer recipe that's ready in 30 minutes. Always a hit at parties!

These bars came to be because I was preparing to move and in an effort to clean out my pantry, I started grabbing things that looked like they’d work together.

Half-eaten package of Oreos. Check.


A small bag of M&Ms that appear to have most of the reds and browns picked out. Check.

Loaded M&M Oreo Cookie Bars - Stuffed to the max with M&Ms and Oreos! Easy, no-mixer recipe that's ready in 30 minutes. Always a hit at parties!

A stick of butter, 1 egg, 1 cup of brown sugar, and 1 cup flour. Check. I always have those items on hand.

And if you do, you can make these in 5 minutes without a mixer and they’re ready in a half hour. Love pans of bars for that reason. Fast, easy, no dough to chill.

Loaded M&M Oreo Cookie Bars - Stuffed to the max with M&Ms and Oreos! Easy, no-mixer recipe that's ready in 30 minutes. Always a hit at parties!

If you don’t have Oreos or M&Ms, shop in your own pantry for what you do have.

Graham crackers, 4-day old leftover chocolate chip cookies that are past their prime, leftover Funsize candy bars from last Easter, the remains of your last impulse buy at Trader Joe’s like chocolate-covered pretzels or that tub of mini peanut butter cups you’ve been snacking on at midnight, or the nearly empty bag of white chocolate chips that you grab a handful of every time you walk past the cupboard.

Loaded M&M Oreo Cookie Bars - Stuffed to the max with M&Ms and Oreos! Easy, no-mixer recipe that's ready in 30 minutes. Always a hit at parties!

You get the point. Don’t buy anything if you don’t have to. Sure, the Oreos and M&Ms are great but so are a lot of other things. Use the recipe as an opportunity to use up your odds and ends.

I’m a big believer in uncluttering my pantry by making odds-and-ends bars every chance I get. I’m also a big believer in bars that are packed to the max with Oreos.

Loaded M&M Oreo Cookie Bars - Stuffed to the max with M&Ms and Oreos! Easy, no-mixer recipe that's ready in 30 minutes. Always a hit at parties!

I used my easy, no-mixer, go-to blondie recipe that has served me so well over the years, and I adapted it this time by stirring in chopped Oreos and sprinkling on M&Ms.

It’ll seem like there are more Oreos than batter, and that’s correct. Such a such a good problem to have.

I used Birthday Cake Oreos, which have birthday cake flavored-filling, but don’t go out of your way for them. They hardly seem different from original Oreos to me.

Loaded M&M Oreo Cookie Bars - Stuffed to the max with M&Ms and Oreos! Easy, no-mixer recipe that's ready in 30 minutes. Always a hit at parties!

The bars are dense, thick, and packed with texture. The Oreos soften slightly while baking, but retain some crunch.

The crunchy shells of the M&Ms, contrasted with Oreos, and the soft, buttery, moist blondie dough is a texture lover’s dream.

Loaded M&M Oreo Cookie Bars - Stuffed to the max with M&Ms and Oreos! Easy, no-mixer recipe that's ready in 30 minutes. Always a hit at parties!

Shopping in my own pantry and widdling down my ingredients before moving was a packer’s dream.

And my family was pretty happy when they had a taste of my pantry cleanout endeavors.

They’re tailor-made for your trashy eating enjoyment. Live a little, it’s fun!

Loaded M&M Oreo Cookie Bars - Stuffed to the max with M&Ms and Oreos! Easy, no-mixer recipe that's ready in 30 minutes. Always a hit at parties!

Loaded M&M Oreo Cookie Bars - Stuffed to the max with M&Ms and Oreos! Easy, no-mixer recipe that's ready in 30 minutes. Always a hit at parties!

Edited to add: This recipe, and my name, appeared on the COVER of Taste of Home Magazine, September 2014. They used their in-house photographer rather than using mine. Facebook post about it here.

Loaded M&M Oreo Cookie Bars - Stuffed to the max with M&Ms and Oreos! Easy, no-mixer recipe that's ready in 30 minutes. Always a hit at parties!

Loaded M&M Oreo Cookie Bars

These dense bars are a texture lover’s dream. There’s an abundance of crunchy chopped Oreos and M&M’s, contrasted with soft, buttery, moist dough. The bars come together in 1 bowl, without a mixer, in 5 minutes, and are ready in under a half hour – great when you need a dessert in a hurry. The recipe is ripe for substitutions, and use it as an opportunity to clean out your pantry and use up your half-eaten bags and odds-and-ends. See blog post for ideas. Pantry cleanout never tasted so good.


1/2 cup unsalted butter (1 stick), melted
1 large egg
1 cup light brown sugar, packed
1 tablespoon vanilla extract
1 cup all-purpose flour
18 Oreo Cookies, coarsely chopped (I used Oreo Chocolate Birthday Cake Sandwich Cookies; another type of chocolate sandwich cookie may substituted, or about 2 heaping cups of coarsely chopped add-ins including leftover cookies, graham crackers, chocolate-covered pretzels, etc.)
about 1/2 cup M&M’s (I used plain, use your favorite flavor or other chopped candy)


  1. Preheat oven to 350F. Line an 8-by-8-inch baking pan with aluminum foil, spray with cooking spray; set aside.
  2. In a large, microwave-safe bowl melt the butter, about 1 minute on high power.
  3. Wait momentarily before adding the egg so you don’t scramble it. Add the egg, brown sugar, vanilla, and whisk until smooth.
  4. Add the flour and stir until just combined, don’t overmix.
  5. Stir in the Oreos.
  6. Turn batter out into prepared pan, smoothing the top lightly with a spatula.
  7. Evenly sprinkle the M&Ms over the top, lightly pressing them down with your finger or a spatula.
  8. Bake for about 20 to 22 minutes, or until done based on add-ins used. Top should be set and edges slightly firm. A toothpick inserted in the center (if you can find a bare patch to test) should come out clean, or with a few moist crumbs, but no batter. Allow bars to cool in pan for at least 30 minutes before slicing and serving. Bars will keep airtight at room temperature for up to 1 week, or in the freezer for up to 6 months.

Recipe from Averie Cooks. All images and content are copyright protected. Please do not use my images without prior permission. If you want to republish this recipe, please re-write the recipe in your own words, or simply link back to this post for the recipe. Thank you.

Only Eats

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Thanks for the Crock-Pot Hook Up Connectable Entertaining System Giveaway ($140 value) entries!

What do you make to clean out your pantry?

230 comments on “Loaded M&M Oreo Cookie Bars”

  1. I love those recipes that just use up a bunch of stuff you have lying around. They usually taste fantastic and you just cleared up a bunch of clutter from your kitchen. Double bonus! These look terrific.

  2. These look incredible! I know my husband will absolutely love them! Oreos and M&Ms are two of his favourite things! Thanks :-)

  3. These M&M Oreo Cookie bars look delicious! Thanks for sharing this recipe!

  4. De impresionante belleza vuestras imágenes.
    Por suerte, ya tenemos todos los ingredientes preparados.
    Si eres de Galicia, o de Vigo, y quieres ver imágenes de platos de Postre de tus restaurantes, sólo tenéis que entrar en https://www.quetecomo.es/restaurantes-en-vigo.php
    Un saludo y muchas gracias desde la web de restaurantes y casas rurales https://www.quetecomo.es/

  5. What’s a half-eaten bag of Oreos? I don’t think it’s something I’ve ever come across. :D

    I love how you can just throw ingredients together and make something pretty! Now I’m craving M&M’s and baking.

  6. I just made some and took it school to share with my friends and we all loved it! definitely saving this one =) thanks for sharing!

  7. These look amazing! Pinning to try later! Oh, and I’m so glad I’m not the only one who eats my baking chocolate chips for snacks. =)

  8. Averie, I love, love, love your cookies, they all look so good!!

  9. Hi! I’ve been dying to make these and I finally made them for my office. Everyone LOVES them! Thank you so much theyre amazing :)

  10. I’m dying for sweets and this just nailed the spot! Definitely making it right now!! It looks so good so I’m sure it will taste just as good ;)

  11. My brother and I have these in the oven at the moment… except we used oreos and a chopped assortment of our favourite chocolate bars (Cadbury Hazelnut, Cadbury Marvellous Creations, and Milk’n’Cookies white chocolate… mmmmmm) instead of M&M’s! Can’t wait for them to be ready, it’ll be glorious! Thank you for an excellent recipe!

  12. Just tried these out! So good, easy to make with great results :)

  13. OMG!!!! Love love love thoughts brownies! My To Do List has all these recipes on it for me to make! The Loaded M&M Cookie Bars made it through a successful 1 hour! My family ate them to fast.

  14. These look amazing! I want to make this for a big group though; can this recipe be doubled for a 9X13 pan?

  15. Would you be able to use pre made cookie dough?

    • Yes you probably could but this dough is so easy, literally takes about 3 mins to stir together, and bite for bite, it’s so much cheaper than storebought, you know what’s in it, i.e. real ingredients, and the recipe was tested using scratch dough in terms of baking time and add-ins it’ll hold.

  16. Hi, I just mde these for my hubbys work. I tested a piece. They’re gonna love it. Really yummy stuff!!

  17. I made these yesterday and gave them to my friends- everyone loved them! They’re so delicious and they were really simple to make which is great considering I mess up everything in the kitchen. They looked beautiful too.

  18. I threw in mini M&Ms, Cookie Crisp cereal, and chocolate chips in the batter. They’re in the oven now! I’m a little nervous though… the consistency came out more like cookie dough than brownie batter.

  19. These bars look so good! I can’t believe it was as simple as just wanting to clean out your cupboards to come up with the idea! I should try that to see what fun creations I could come up with. They sound very simple to make and like there isn’t too many ingredients. For those of us who are learning to cook and bake, simple and few ingredients is the best way to learn, at least for me it is. I can’t wait to try these bars. I was also surprised that the total cook time was only 30 minutes. It seemed like it should have been longer, but the shorter the cook time the sooner you get to eat. There were many other bars you posted pictures of on this blog that look like they would be very good to try as well. I think that they would be extremely delicious with ice cream! The smore brownie looked especially good since I am a big fan of smores in the first place. Well looking at this site it made me very hungry! Keep posting your delicious looking desserts so we can enjoy making them because they look amazing and good!

  20. First of all, your photography is to. die. for. amazing. Anyway, if I wanted to make extra and do it in a 9×13, I’m assuming I should just double the recipe?

  21. I just made these and they are GREAT! So quick and easy! Thanks!!

  22. You have just made half of my family happy! I want to thank you for your wonderful recipe, I made it for a baby shower and now its being requested so much I am making “just because” gifts! Thanks for making me think I can truly bake!

  23. Finally unpacked and settled enough to bake – whew! I’m making a double batch of these (I used an entire oreo bag plus an entire m&m bag) to impress my hubby’s classmates tomorrow. Your recipes never let me down. :-)

    • Thanks for trying this recipe and for saying that my recipes never let you down. This is one of my most popular recipes ever and people seem to love these things so hopefully your hub’s classmates do, too! With a whole pkg of Oreos and bag of M&Ms, it would be hard for them to resist these I’d imagine :)

  24. Do you think i could use whole wheat flour to make these?

    • You could, yes, but I don’t know if it would taste quite the same or with the same texture. I recommend maybe half the amount as whole wheat so the taste/texture doesn’t change too much.

  25. I made the left overs bars for our camping trip tomorrow I used gram cereal, peanuts, snickers, butterfinger, chocolate bars and heath chips I cant wait to try them :D

  26. I just want to say that I have made this twice in two days… I LOVE them!! Absolutely love them!
    It’s not the ordinary kind of baked goods one see here in Denmark. So I sure am glad that I found this recipe.
    Thank you so much!

  27. I made the recipe and followed every step but the dough keeps very wet on the bottom… And I mean VERY wet. After two hours of letting it rest and cooling down I put it twice on 100degr for 10min extra but stil nothing. A little bit disappointed but I’ll just take the chops with me to competition tomorrow and let my testpanel judge… ;-)

    • Sounds like you maybe needed to bake a bit longer during the originial baking time. After you let something cool, then putting it back into the oven for 10 mins or so, doesn’t always work. Bake a bit longer next time perhaps given your oven, climate, pan, etc. Thanks for trying the recipe.

  28. Hi….so as an absolute amateur baker I made these for the first time yesterday and cannot tell you how easy they are to make and how delicious they are. I used chocolate chips instead.
    I was a little scared when I prepared the batter as it was way to dark in colour but while baking the brownies came out perfect.
    Thanks for this simpls recipe

  29. I’m an oreo and M&M lover and these bars are calling my name!

  30. I’ve made these quite a few times now, and they never get old. It’s ridiculous how easy they are, especially when you consider how good they are, and how happy they make everyone who tries them. I’m not a big fan of store bought, simply because I enjoy baking, but sometimes I don’t have the time/patience for a more complicated and/or time consuming recipe. With this recipe I have no excuse but to make my own baked goods!

    I love that you can just sort of throw in whatever leftover candy and cookies you have. Tonight’s version involved Oreos, Reese’s Pieces, peanut butter chips, and Whoppers. One of my coworkers calls them “trash bars” because of all the random add ins. But she uses this term lovingly, she’s the biggest fan of these I know :)

    I’ve also made your peanut butter version. Equally easy and delicious!! Thank you!

  31. Made them tonight. Really loved them. Delicious and chewy and…..
    Thank you for the recipe. I will definitely try more of the things you publish.

  32. So I made the oreo m&m cookie bars and the cookie part has a veryyyy strange taste. Almost like too much vanilla or too much brown sugar. I followed it correctly! I dont know what went wrong but they do not taste like normal cookies at all!!!

    • Not sure what to tell you…are you sure all your ingredients were fresh and nothing had gone bad? I’ve literally had thousands of people write to me in emails saying they’ve made these and everyone loves them. They don’t taste like a normal cookie, per se, because they’re doctored up with M&Ms and Oreos but they should taste similar, but in an enhanced way, to what an M&M Cookie would taste like. I am thinking you maybe mis-measured or something went bad and you didn’t know. That’s all I can think of?

  33. I know the beauty of the recipe is how east and fast it is, but can you chill this dough?

    • I would say you are FINE with chilling it. I would press it into the pan, cover the pan and/or place into a big ziplock bag, refrigerate, and you could probably leave it in the fridge chilling for up to 5 days. That’s what I do with my regular cookie dough. Don’t just chill the dough in the mixing bowl though. It will turn into a ROCK. Get it in the pan, then chill.

  34. I made 2 separate batches, one with Nutter Butter cookies and one with Oreos. I followed your recipe to the letter and each batch came out underdone. I used an 8×8″ Pyrex dish, lined with foil & sprayed. I baked them 22 minutes and they tested done in the center. When cool, I cut them and the middle & bottom of the bars were like raw cookie dough consistency. Do I need to bake them longer (even though they tested done) or possibly add more flour? Your bars look brown on the top & bottom and fudgy in the middle. Please help!

    • Things baked in glass (Pyrex) generally take longer to bake than in an aluminum pan. I called for an aluminum pan. So if you used glass, you’ll probably have to bake a bit longer. And yes, bake til DONE, whatever that means in your oven/pan, not based on what the clock says.

      • Averie your recipes are so good, I really want to get this one right. The recipe says “line an 8×8 baking pan with aluminum foil & spray”, doesn’t say to use an aluminum pan. Do you use an aluminum pan & line with aluminum foil or just use an aluminum pan sprayed with cooking spray? Thanks again!

      • In cookbooks/recipes, baking pans are generally presumed to be aluminum unless a recipe specifically says use a glass baking dish. So yes, this is an aluminum pan lined with foil (saves time and I recommend it but if you don’t want to you could skip the foil). Enjoy!

  35. I made these this weekend per the request of my best friend’s boyfriend. (I’m not really sure how he came across the recipe – pinterest, perhaps?) I set them out at brunch yesterday and everyone LOVED them. I’m seriously obsessed with all your blondie recipes. They never fail – crowd pleasers 100% of the time!

  36. This is my go to dessert! Do you think it could easily be doubled?

  37. Hey there! This is by far the best cookie recipe I’ve seen on the internet. I have a question though. Could I use tge same recipe to make the regular round cookies? And if so, will this change the time spent in the oven? I’m just dying to gift my friends wrapped cookies as we’re all M&M’s and Oreo lovers and this is just beyond perfection!!

  38. Hey there! This is by far the best cookie recipe I’ve seen on the internet. I have a question though. Could I use tge same recipe to make the regular round cookies? And if so, will this change the time spent in the oven? I’m just dying to gift my friends wrapped cookies as we’re all M&M’s and Oreo lovers and this is just beyond perfection!!

  39. I liked your pictures better :-)!

  40. Made these for my family and boyfriend & they turned out delicious! Thank you so much for the recipe!

  41. So I just made these and they came out amazing taste wise but when i cut the bars they started to fall apart, just wondering what went wrong?

    • Possibly over-baked them slightly and they became a bit too crumbly upon slicing them? Or possibly chopped the Oreos too finely and they acted more like ‘flour’ and a dry ingredient rather than just chunks of cookies? I would say reduce baking time a bit, chunkier Oreos, and maybe in your case a tbsp or two less flour next time…these are just my hunches.

      Glad they tasted great though and thanks for trying the recipe!

  42. Have made these twice now – first, following the recipe exactly and second batch, adding a splash of milk and a spoon of golden syrup. Both went down very well but the second batch were moister and sweeter (but not over-sweet). Great, simple and very effective recipe though! Dead quick to make too!

  43. These look amazing!!! Perfect combination of Oreos and M&M’s! 

  44. I was getting everything ready to make these when I realized that I used up the last of my m&m’s with the last cookie recipe, so I substituted chocolate chips instead. I stirred them into the batter and also used 14 instead of 18 oreos (14 was all I had on hand). They were incredibly delicious – almost sinful! My new favorite from your blog – and I love so many of your recipes. They were dangerously easy and quick to make – I guess I will spend more time at the gym!

    • Thanks for trying the recipe and I’m glad it came out great for you, and a few minor tweaks and swaps, in bars like this…totally fine! I often run into that whoops not quite enough Oreos issue because of midnight snacking issues :)

      Glad to hear this is your fave, too, from my blog!

  45. Hi, Averie! I tried your recipe tonight and I’m not sure what I did wrong. I used a 9×13 and doubled the recipe. I left them in a little longer to get the batter to cook, but all the Oreos seemed to have melted. They were just goo at the bottom if the dish, without any crunch. Mine also weren’t as sweet as I was hoping they’d be. I was wondering if I could use less Oreos and put more m&ms directly into the mix? Maybe even sugar? In a beginner baker so I don’t know, I just wanted to sweeten it up a little. My friends liked it regardless! I made these for a bake sale. THanks for sharing!

    • I have never personally doubled this recipe so I am thinking there’s an issue there. Also make sure you’re not chopping the Oreos too finely; you really want a rough chop. Like each Oreo maybe just quartered and that will keep the pieces from being so small they just disappear and melt. I really don’t think if you just make the recipe as written and keep the pieces bigger that you’ll find it not sweet enough. If you do bake them and you still think they’re not sweet enough, I’d just do a hot fudge drizzle over the top but I doubt you’ll need it. LMK how things go!

  46. I’ve made these bars a dozen times probably and never commented on here. Just wanted to say I love this recipe, thanks for posting it!

  47. Always a winner, made two batches last weekend, one just as you suggested here, the other loaded with Do-Si-Dos, peanut butter chips and milk chocolate chips – YUM!!  Love the versatility of this recipe!

    • Thanks for trying the recipe and I’m glad it came out great for you! I totally want to make with Do-Si-Dos, peanut butter chips and milk chocolate chips now too! I just made a recipe for next week with Nutter Butters, Pb chips and choc chips :)

  48. Just wanted to chime in, great recipe, though when the dough was finished I worried I’d done it wrong, it seemed so syrupy.  One caveat, I found a type of oreo that unfortunately doesn’t work well.  The absolutely delicious reeses peanut butter oreos they came out with in 2015.  They just don’t solidify enough to work in the bars, so some parts seem undercooked even when they aren’t.  This still tastes delicious, just means that they aren’t really presentable for serving to anyone other than immediate family :-)   It’s a shame, that flavor of oreo is super tasty and gives an interesting additional depth to the bars.  It just doesn’t hold together with them.  I’ll have to use regular next time :-)

    • The reason the Reeses peanut butter oreos likely don’t work is because of all the peanut butter/oils found in them, that’s just inherent to PB. You really want that classic Oreo, chocolate or even the vanilla-based versions, just nothing with PB. After writing a cookbook about PB, trust me there’s so much I learned :)

      If you’re looking for an AMAZING Pb dessert that uses PB cookies, make these! Just posted them https://www.averiecooks.com/2015/05/chocolate-peanut-butter-dream-bars.html and made with Nutter Butters. Crazy.crazy.good.

  49. These look so good i think I’m gonna try them tomorrow! but i have one question, instead of m&m’s could i use like 1-2 cup mini marshmallows in the batter? so it would be a loaded oreo & marshmallow bar? I’m wondering cuz maybe marshmallow might burn faster? i hope not cuz i already made a bar using m&m’s the other week so now i wanna try something different and i think those two would be  good combo! – pls let me know -thanks ! :)

  50. Wondering if these can be baked then frozen? I offered to make cookies for my nieces grad party next month but wanted to get it done now instead of at the last minute. :-) 


    (This question is regarding all of the bar recipes I saw here)

    • For the most part, yes, you can make, cool, wrap well, then freeze. Being that you are serving them at a party, well, if it were me I would make them 24-36 hrs ahead of time if possible b/c it is a special event, rather than taking something out of the freezer but totally your call. You can freeze most of my bars, they’ll be fine upon thawing, but just have to throw that fresh is always best caveat in there.

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