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! 

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.

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

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. 

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! 

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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 minutes

Cook Time: 18 minutes minutes

Cooling Time: 1 hour hour 30 minutes minutes

Total Time: 1 hour hour 53 minutes 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

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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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