Loaded M&M Oreo Cookie Holiday Bars

Loaded Holiday M&M’s Cookie Bars — These M&M’s cookie bars are packed with holiday M&M’s and crushed Oreos. This is an easy, one-bowl holiday dessert your family will love! 

stack of four oreo and M&M's Cookie Bars

Loaded Christmas Bar Cookies

These M&M’s cookie bars are famous. Well, maybe not these exact bars but the original recipe is. The original recipe has been Pinned over 1 million times and appeared on the cover of Taste of Home Magazine in 2014.

I made the original recipe on a whim because I was moving and had a half package of both Oreos and M&M’s open, didn’t want to move them, didn’t want to toss them, made the bars, and the rest is history.

This cookie bars recipe is a spinoff on my trusty blondie base. When I want an easy, fuss-free, one-bowl, no-mixer recipe that I know everyone will love, it’s my go-to. With 30+ versions and counting, it never lets me down.

It’s an easy recipe to memorize because everything is ‘one’. In the 1 bowl used, melt 1 stick of butter, stir in 1 egg, 1 cup of brown sugar, 1 tablespoon vanilla, 1 cup flour. For this version, there’s Oreos and M&M’s added.

I was on the hunt for red or green-filled seasonal Oreos but was just a bit too early when I made the bars a few weeks back. I think mint M&M’s or mint Oreos would be a great touch here as well.

These M&M’s cookie bars are loaded with goodies in every bite. Crunchy Oreos and crisp M&M’s are a great texture contrast to the soft, buttery bars.

M&M's Cookie Bar surrounded by holiday M&M's

What’s in M&M’s Cookie Bars?

To make these easy cookie bars, you’ll need:

  • Unsalted butter
  • Egg
  • Brown sugar
  • Vanilla extract
  • All-purpose flour
  • Salt
  • Oreo cookies 
  • M&M’s

stack of oreo and M&M's Cookie Bars

How to Make M&M’s Cookie Bars

Melt the butter, then stir in the egg, vanilla, and brown sugar. Stir in the dry ingredients, then gently fold in the M&M’s and chopped Oreos. 

Turn the batter into a greased 8×8-inch baking dish and bake until the top is set in the center and done. The toothpick test is a bit tricky because there aren’t many bare batches, but if you hit a patch of just dough, the toothpick should come out clean, or with a few moist crumbs, but no batter.

Place pan on a wire rack to cool for at least 90 minutes before slicing and serving.

Want to see how to make cookie bars? Watch the video! 

Can I Add Other Mix-Ins? 

Of course! You can add other chopped holiday candies and chocolates to these M&M’s cookie bars. 

Can I Double This Recipe? 

Yes, simply double the ingredients and bake these cookie bars in a 9×13-inch pan. 

Loaded M&M Oreo Cookie Holiday Bars - Stuffed to the max with M&M's and Oreos!! Easy, no-mixer recipe that's ready in 30 minutes!! A guaranteed hit with everyone!!

Tips for Making M&M’s Cookie Bars

You just need to roughly chop the Oreos for these M&M’s cookie bars. You want them to be big enough to bite into, but not so big that you’re trying to chew half an Oreo at once. 

I made this recipe as Christmas bar cookies, but you can make these bars for any holiday. Just switch out the holiday M&M’s for whatever color you’d like. You can even add seasonal Oreos to the mix, if desired.

These M&M’s cookie bars can be kept on your counter for a few days, or you can pop them into a freezer bag and freeze them for later. They’re a great treat to have stashed in the freezer for last-minute guests this time of year! 

Loaded M&M Oreo Cookie Holiday Bars

Loaded M&M Oreo Cookie Holiday Bars

These M&M's cookie bars are packed with holiday M&M's and crushed Oreos. This is an easy, one-bowl holiday dessert your family will love!

Yield: 9 bars
Prep Time 5 minutes
Cook Time 18 minutes
Cooling Time 1 hour 30 minutes
Total Time 1 hour 53 minutes

Ingredients

  • 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
  • 1/2 teaspoon salt, or to taste
  • 18 Oreo cookies, roughly chopped
  • 1/2 cup M&M’s (I used Dark Chocolate Red and Green M&M’s)

Instructions

    1. Preheat oven to 350F. Line an 8-by-8-inch baking pan with aluminum foil, spray with cooking spray; set aside.
    2. To a large, microwave-safe bowl add the butter and heat to melt, 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, salt, and stir until just combined, don’t overmix.
    5. Add the Oreos and stir to combine.
    6. Add the M&M’s and stir to combine.
    7. Turn the batter out into prepared pan, smoothing it lightly with a spatula and pushing it into the corners. Tip – Strategically place a few Oreos and M&M’s on top for visual appeal.
    8. Bake for about 18 to 21 minutes, or until top is set in center and done; don’t overbake. Bars firm up as they cool. A toothpick test is a bit tricky because there aren’t many bare batches, but if you hit a patch of just dough, the toothpick should come out clean, or with a few moist crumbs, but no batter.
    9. Place pan on a wire rack to cool for at least 90 minutes before slicing and serving.

Notes

  • Bars will keep airtight at room temperature for up to 1 week, or in the freezer for up to 6 months.
  • Recipe adapted from Loaded M&M's Oreo Cookie Bars.

Nutrition Information:

Yield:

9

Serving Size:

1

Amount Per Serving: Calories: 394 Total Fat: 18g Saturated Fat: 9g Trans Fat: 0g Unsaturated Fat: 4g Cholesterol: 49mg Sodium: 230mg Carbohydrates: 56g Net Carbohydrates: 0g Fiber: 1g Sugar: 37g Sugar Alcohols: 0g Protein: 3g

More Cookie Bars:

Holiday Sugar Cookie Bars with Cream Cheese Frosting — The bars are buttery soft in the middle with a bit of chewiness around the edges and have nice texture from the baked-in sprinkles.

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!

Snickerdoodle Bars with Cream Cheese Frosting — Snickerdoodle bars are so much FASTER AND EASIER than making snickerdoodle cookies!! The sprinkles and tangy cream cheese frosting will put everyone in the holiday spirit!!

M&M’S Chocolate Chip Cookie Bars — Soft buttery bars loaded with M&M’S and chocolate chips are a guaranteed hit! Fast, easy, foolproof, no mixer recipe that’s so much simpler than making cookies!

M&M’S Chocolate Chip Cookie Bars - Soft buttery bars loaded with M&M’S and chocolate chips are a guaranteed hit!! Fast, easy, foolproof, no mixer recipe that's so much simpler than making cookies!!

Triple Peanut Butter Monster Cookie Bars – Peanut butter is use 3 different ways! Peanut butter lovers will go nuts for these!

Triple Peanut Butter Monster Cookie Bars - Easy One-Bowl Recipe at averiecooks.com

Banana Oatmeal Chocolate Chip Cookie Bars — A FAST and EASY dessert that is on the HEALTHIER side with only 1/4 cup butter and no oil!! Bold banana flavor, chewiness from the oats, and plenty of chocolate in every bite!!

Peanut Butter Chocolate Chip Bars — These peanut butter chocolate bars are loaded with chocolate chips and creamy peanut butter. This is a one-bowl dessert you’re bound to love!

 

58 comments on “Loaded M&M Oreo Cookie Holiday Bars”

  1. I made these over christmas and they were SO delicious!! everyone at work loved them!! all your recipes are so good :)

  2. A yummy easy treat to bake! Everyone really loved them!

    Rating: 5
  3. Wildly addictive and super easy to make. I always have to double the recipe. Making these for the third time this week. Everyone thinks I am a genius. Thanks, Averie!

    Rating: 5

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