Triple Layer Fudgy Mint Oreo Brownies

Happy Saint Patrick’s Day! A few weeks early, but who’s counting.

Triple Layer Fudgy Mint Oreo Brownies

I couldn’t resist sharing these.


Triple Layer Fudgy Mint Oreo Brownies

These brownies are the best thing to come out of my kitchen thus far in 2012.

I know we’re only two months into the year, but I assure you, these take the cake take the brownie.

Triple Layer Fudgy Mint Oreo Brownies

Let’s talk about what’s going on in them. First there is an incredibly dense, rich, and fudgy brownie base layer. I adapted my own Fudgy Nutella Brownies, which are my favorite brownie recipe of all time, and I’ve sampled one or two brownies over the years. It’s the best-tasting (and easiest) brownie-from-scratch recipe I’ve ever tried because the resulting brownies are incredibly fudgy, dense, and not at all cakey or dry.

To the brownie batter for the base layer, I added a dozen crumbled Cool Mint Oreo Cookies (Layer 1)

Triple Layer Fudgy Mint Oreo Brownies

I also made a green minty marshmallow mixture, comprised of Marshallow Fluff, peppermint extract, and green food coloring, and I swirled half of it through the brownie batter along with the crumbled Oreos.

To say this green mixture is “pretty good” is an understatement: white chocolate chips + buttercream frosting + Marshmallow Fluff + peppermint extract = Dive In and Don’t Come Up For Air.

I would like to have this stuff on hand for mental health days because a spoonful of it is guaranteed to put a smile on your face. Rich, sweet, decadent, minty, yet still fluffy.

While the brownies were baking I made the next layer (Layer 2):

melted white chocolate chips

made a batch of buttercream frosting

combined the white chocolate chips + buttercream frosting + the remaining half of the green minty marshmallow mixture

After spreading the Green Goddess over the cooled brownies and because there wasn’t enough going on already, I crumbled a dozen and a half more Cool Mint Oreos over the top (Layer 3)

Triple Layer Fudgy Mint Oreo Brownies

This recipe below looks long because I gave instructions for how to make both brownies and frosting from scratch.

Use a boxed brownie mix and a can of frosting if that’s what it takes for you to make these.

Triple Layer Fudgy Mint Oreo Brownies

Yes, there are a few stages and steps but it’s all worth it, I promise. Really you’re just making brownies, making a green minty marshmallow mixture, and crumbling Oreos everywhere. Not hard at all and no electric mixer is necessary.

Triple Layer Fudgy Mint Oreo Brownies

I cannot convey to you how good these are:

The brownies themselves are so rich, and the mint Oreos crumbled in the batter add a crunchy minty surprise.

The green minty marshmallow mixture that is swirled throughout the brownie batter add a sweet soft surprise.

(I’m all about contrasting flavors and textures)

The top layer of green minty marshmallow mixture, with melted white chocolate chips, vanilla buttercream frosting, and more crumbled Oreos…

Heaven-sent. Or Saint Patrick sent.

Triple Layer Fudgy Mint Oreo Brownies

PMS? Bad day? Child not cooperating? Husband not cooperating? Your dog ate your homework? Your favorite lip gloss has been discontinued? You typically don’t celebrate St. Patrick’s Day? You just got a parking ticket? Your boss is mean? Your best friend forgot your birthday? Your husband forgot your birthday?

Not a problem. Have one of these.

Triple Layer Fudgy Mint Oreo Brownies

Mint Oreos, chocolate, and green food will cure whatever ails you. And by green food, I do mean one of these and not a kale salad.

Triple Layer Fudgy Mint Oreo Brownies

Both Saint Patrick and I urge you to make these.

Triple Layer Fudgy Mint Oreo Brownies

Print Recipe

Triple Layer Fudgy Mint Oreo Brownies

These layered brownies are loaded with rich textures and flavors, from the dense fudgy brownies layer, to the soft, fluffy minty layer, with oodles of crushed Mint Oreos throughout. Use regular Oreos if you can’t find Mint Oreos and possibly add a touch more mint extract to the filling. As a shortcut, feel free to use your favorite boxed brownie recipe for the brownie layer, and to use 1 cup to 1 can of storebought vanilla frosting for the frosting and topping layer. They're rich, decadent, and everyone loves these!

Yield: 9x13-inch pan, 18 to 24 brownies

Prep Time: 30 minutes

Cook Time: about 23 to 25 minutes

Total Time: about 1 hour, for cooling



one 7-ounce jar Marshmallow Fluff

1/8 teaspoon mint extract*

8 drops+ green food coloring, or until desired shade of green is reached

1 batch of brownies – see ingredients below in step 2 (or use 1 box of brownie mix – make according to directions on the box by adding the water, oil, eggs)


4 ounces baking chocolate (I used 9 squares of TJ’s 72% chocolate bar or use 4 squares Baker’s Chocolate, semi-sweet)

3/4 cup unsalted butter, melted (1 1/2 sticks)

2 cups granulated sugar

3 eggs

1 teaspoon vanilla extract

2 tablespoons espresso or brewed coffee, optional

1 cup all-purpose flour

12 Cool Mint Oreo Cookies, hand-crumbled

Frosting and Topping

1/2 cup butter or margarine, softened

3 to 4 cups powdered sugar

1 teaspoon vanilla extract

splash of milk, if necessary for consistency

3/4 cup white chocolate chips, melted

18 Cool Mint Oreo Cookies, hand-crumbled


1. Preheat oven to 350°F. Line a 9×13-inch pan with foil and spray it with cooking spray.

2. Filling - In medium bowl, stir together marshmallow fluff, mint extract* (be very careful and do not use more than this unless you love mint; a little bit of mint goes a very long way), 4 drops of food coloring, or until light green is achieved; set aside.

2. Brownies - Microwave chocolate and butter in large microwave-safe bowl for 90 seconds or until butter is melted. Stir until chocolate is completely melted. Stir in sugar (it will seem very granular, this is okay). Stir in eggs and vanilla. If adding espresso or coffee, add it now. Stir in flour until just combined, do not overmix. Hand-crumble 12 Oreos over the bowl and fold them in.

3. Spread brownie batter in prepared pan.

4. Drop about 1/2 cup of green filling mixture onto brownie batter and reserve the remainder. Gently pull a table knife through the batter in S-shaped curves for a swirled design.

5. Bake 23 to 25 minutes or until brownies are set, taking care not to overbake. (Some people’s ovens and taste preferences may require 25-30 minutes, bake until brownies are done and to your liking) Cool completely, about 1 hour, or put the pan into the freezer for 10 minutes if you’re rushed.

6. Frosting and Topping - While brownies are cooling, make vanilla frosting by whisking together the butter, confectioners' sugar, vanilla, and milk as needed until smooth and fluffy, or beat with an electric mixer. Optionally use 1 cup storebought vanilla frosting – or use entire can if you want a thicker final green layer.

7. In another small microwave-safe bowl, melt the white chocolate chips (microwave on high for 30 seconds; stir and microwave 30 seconds longer; stir until smooth, taking care not to scorch it as white chocolate scorches easily).

8.Add the melted white chocolate chips and the vanilla frosting to the reserved green minty marshmallow mixture.

9. Stir in 4 drops+ food coloring, or until light green color is reached, and spread over cooled brownies.

10. Sprinkle with 18 hand-crumbled Oreo Cookies, slightly pressing them into the green mixture. Allow top layer to set fully before slicing and serving. I prefer these bars chilled and I store them in the refrigerator in an airtight container for up to 10 days or in the freezer for up to 6 months.

If you’re a fan of mint, you may enjoy these other desserts, all of which are also mint + chocolate combinations:

Girl Scout “Thin Mint”-Inspired Fudge (Raw, Vegan, GF)

Chocolate Peppermint Donut Holes (Raw, Vegan, GF)

Creme de Menthe Bars (No-Bake, Vegan, GF)

Peppermint Patties (Raw, Vegan, GF)

Mint Chocolate Coconut Snowballs (Raw, Vegan, GF)

Mint and Chocolate Fudge Oreo Bars

Do you celebrate St. Patrick’s Day?

Not only are these brownies perfect for St. Paddy’s Day, but they would also be wonderful for Christmas and winter holiday parties.

They are going on my 2012 holiday baking list. It’s never too early to start thinking about holiday baking season, 8 months in advance.

Do you like mint-flavored foods?

I do, but a little mint goes a long way and once you add it, you cannot un-do it. I learned that the hard way when I once made creme de menthe bars that tasted like I was eating a bottle of Listerine, so easy does it when adding mint.

Happy St. Paddy’s Day!


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  2. I just made these! Can’t wait for my husband to try them. They look so yummy. Definatly not good for my diet! :-)

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  4. Happy Valentines Day with these brownies!! I am going nuts over here. I’ve looked at the picture probably 20 times in a minute. I am 4 months pregnant and chocolate minty chewy gooey brownies is exactly what I need tonight! Hope my husband likes them, but if not…more for me. I absolutely love mint and chocolate anything. Thank you for sharing these delightful brownies with everyone!

    • They are CRAZY good. I was actually thinking about them yesterday b/c St Paddy’s Day is a month away and I was wondering what I could make to top those…and really, nothing. I am going to have to do in a whole other direction b/c as mint brownies go, those are the best I’ve ever had and super decadent. Enjoy them!! :) LMK how they work for you!

  5. these look so amazing! I want to eat them straight from the computer!!
    I just wanted to know if the marshmallow fluff is neccesary for the recipe?
    Can I leave it out? or will it ruin the recipe?

    • Well to make that middle layer you need it; the recipe won’t be ‘ruined’ without it; but if you skip it, you won’t have created the finished product you seem to be drooling over on the screen :)

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  9. These look like heaven to me!!! Question: do you advise against making them a day or two ahead of time?

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  12. These look beyond amazing and I can’t wait to make them tomorrow for our family’s St. Patty’s Day festivities!! I’m seriously drooling just thinking about them! Do you have any suggestions for making them at altitude? I know if I can manage to nail this recipe they will be a massive hit. Can’t wait

    • I bake at sea level (San Diego) so really don’t know a thing about altitude baking. I would just follow similar protocols with adjusting the baking time maybe 5 mins like you normally do? Just use common sense and bake til done…hard to screw up brownies :) LMK how they go!

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  16. I just made these for a party tomorrow! They look amaze, I will let you know how they go over. Thanks for the fun recipe, it was a blast making this!

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  23. I made these for St Patrick’s day and they were a hit! I want to make them again but pink for a breast cancer fundraiser. Any suggestions on what to substitute for the mint?

  24. Hi Averie,
    This is a long shot and I know you can’t really know what I have done but I thought I’d ask: I’m making these brownies right now and am on the frosting section. I’ve mixed the softened butter, vanilla, and the powered sugar but the result is a bowl full of small round pellets. Some of the butter was melted before I added it, could that be the problem? Or do I just need to add milk? I completely understand if you can’t help but I thought I’d ask. A run to the grocery for canned frosting might be in order!!

    Thank you!

  25. OMG thnking of making these for Christmas. They look beautiful and you detailed the recipe so well!! I’ll let u know how they turned out.

  26. Just made these! Mine definitely aren’t as tall as yours are, but they came out great and I think I am going to be selling them at an upcoming bake sale!

  27. I made these and they were out-of-this-world fantastic! I posted them on my blog and linked back to you, of course :) Thanks so much for the great recipe!

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  32. Hello,

    In step 4 it says:

    4. Drop about 1/2 cup of green filling mixture onto brownie batter and reserve the remainder.

    I might have missed it, what do you do with the remaining filling mixture?

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  39. I love–LOVE!–that you use normal, easy-to-find, every day ingredients, and not the gluten-free this, artificial sweetener that, zero fat/zero taste glop. I hate the recipes that claim to be so wonderful, yet when one takes a bite, it feels and tastes as if one bit into a bar of soft soap. Your recipes are made from ingredients I’ve used for all of my 54 years of cooking and baking, and I appreciate that SO VERY MUCH!!

    • Wow, what a great comment and thank you for noticing that I try to gear and write my recipes for REAL people who are shopping at regular grocery stores and just want to make something that tastes great without tons of fuss :)

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