Loaded M&M Oreo Cookie Holiday Bars

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Loaded Holiday M&M’s Cookie Bars â€” 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 Holiday M&M's Cookie Bars â€” 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! 

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4.41 from 60 votes

Loaded M&M Oreo Cookie Holiday Bars

By Averie Sunshine
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!
Prep Time: 5 minutes
Cook Time: 18 minutes
Cooling Time: 1 hour 30 minutes
Total Time: 1 hour 53 minutes
Servings: 9 bars
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Ingredients  

  • ½ cup unsalted butter, 1 stick, melted
  • 1 large egg
  • 1 cup light brown sugar, packed
  • 1 tablespoon vanilla extract
  • 1 cup all-purpose flour
  • ½ teaspoon salt, or to taste
  • 18 Oreo cookies, roughly chopped
  • ½ cup M&M’s, I used Dark Chocolate Red and Green M&M’s

Instructions 

  • Preheat oven to 350F. Line an 8-by-8-inch baking pan with aluminum foil, spray with cooking spray; set aside.
  • To a large, microwave-safe bowl add the butter and heat to melt, about 1 minute on high power.
  • Wait momentarily before adding the egg so you don’t scramble it. Add the egg, brown sugar, vanilla, and whisk until smooth.
  • Add the flour, salt, and stir until just combined, don’t overmix.
  • Add the Oreos and stir to combine.
  • Add the M&M’s and stir to combine.
  • 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.
  • 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.
  • 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

Serving: 1, Calories: 394kcal, Carbohydrates: 56g, Protein: 3g, Fat: 18g, Saturated Fat: 9g, Polyunsaturated Fat: 4g, Cholesterol: 49mg, Sodium: 230mg, Fiber: 1g, Sugar: 37g

Nutrition information is automatically calculated, so should only be used as an approximation.

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About the Author

Welcome to AverieCooks! Here you’ll find fast and easy recipes that taste amazing and are geared for real life. Nothing fussy or complicated, just awesome tasting dishes everyone loves!

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Please note: I have only made the recipe as written, and cannot give advice or predict what will happen if you change something. If you have a question regarding changing, altering, or making substitutions to the recipe, please check out the FAQ page for more info.

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Comments

  1. 5 stars
    These are amazing! I made them during the holidays and my son asked me to make them for his bday (it’s now January). Thank you for the recipe

  2. 5 stars
    These are amazing! I made them during the holidays and my son asked me to make them for his bday (it’s now January). Thank you for the recipe

    1. Thanks for the 5 star review and I am glad these were a holiday and now bday favorite! I am glad your son asked for them again – happy birthday to him!