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Loaded M&M Oreo Cookie Holiday Bars
4.4 from 180 votes

Loaded M&M Oreo Cookie Holiday Bars

Loaded M&M Oreo Cookie Holiday Bars combine a soft, buttery cookie base with chunks of Oreo cookies and colorful M&M's scattered throughout. The bars offer a chewy, sweet treat with both crunch and melt-in-your-mouth textures, suitable for holiday festivities or casual snacking.

Prep Time
5 mins
Cook Time
18 mins
Cooling Time
1 hr 30 mins
Total Time
1 hr 53 mins
Servings: 9 bars
Calories: 394 kcal
Course: Baked Goods
Cuisine: American

Ingredients

  • ½ cup butter 1 stick, melted, unsalted
  • 1 egg large
  • 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 candy I used Dark Chocolate Red and Green M&M’s

Instructions

    Cup of Yum
  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

  • Preheat the oven fully before baking to ensure even cooking and proper texture.
  • Melting butter and mixing it warm helps sugar dissolve properly for smooth batter.
  • Stir in Oreos and M&M’s gently to avoid crushing them too much for distinctive chunks.
  • Allow bars to cool completely before slicing to prevent crumbling.
  • Use an 8x8-inch pan lined with foil for easy removal of bars after baking.

Nutrition Information

Serving 1 Calories 394kcal (20%) Carbohydrates 56g (19%) Protein 3g (6%) Fat 18g (28%) Saturated Fat 9g (45%) Polyunsaturated Fat 4g (24%) Cholesterol 49mg (16%) Sodium 230mg (10%) Fiber 1g (4%) Sugar 37g (74%)

Nutrition Facts

Serving: 9 bars

Amount Per Serving

Calories 394

% Daily Value*

Serving 1
Calories 394kcal 20%
Carbohydrates 56g 19%
Protein 3g 6%
Fat 18g 28%
Saturated Fat 9g 45%
Polyunsaturated Fat 4g 24%
Cholesterol 49mg 16%
Sodium 230mg 10%
Fiber 1g 4%
Sugar 37g 74%

* Percent Daily Values are based on a 2,000 calorie diet.