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Loaded M&M Oreo Cookie Holiday Bars

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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 - 3 stack of four oreo and M&M's Cookie Bars - 4

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 - 5 M&M's Cookie Bar surrounded by holiday M&M's - 6

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 - 7 stack of oreo and M&M's Cookie Bars - 8

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.

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!! - 9 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!! - 10

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 — 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!  - 11 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!  - 12

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

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

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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

Loaded M&M Oreo Cookie Holiday Bars - AverieCooks.com