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M&M Cookie Bars

M&M Cookie Bars

M&M Cookie Bars are soft and chewy, and are easily made with only four ingredients. If you love M&M's, this is the ultimate treat to make. We guarantee it will satisfy your sweet tooth many times over!

Course Cookie Bars, Dessert
Cuisine American
Keyword M&M Cookie Bars
Prep Time 10 minutes
Cook Time 20 minutes
Total Time 30 minutes
Servings 12 cookie bars
Calories 486 kcal
Author Catalina Castravet


  • 1 box vanilla cake mix
  • 2 large eggs
  • 1/2 cup (1 stick) unsalted butter melted
  • 2 cups M&M's


  1. Preheat oven to 350 degrees F. Spray a 9x9-inch pan with nonstick spray. Cover bottom with parchment paper in a way that overhands on two sides, for easy cookie bars removal.

  2. In a large bowl, stir the first three ingredients together until well combined. Add M&M's and stir until well combined.

  3. Spread and pat the cookie dough in the pan. Level the top with a spatula.

  4. Bake for about 25-35 minutes or until golden brown. A toothpick inserted in the center should come out clean, or just a few crumbs, but not raw batter.

  5. Let the cookie bars cool before cutting, as cooling will allow them to firm a bit.

  6. Using the parchment paper handles, lift the cookie from the pan and cut into bars.

Recipe Video

Recipe Notes

The recipe can be made in a 9x13 inch pan, the baking time will change, the bars will be thinner and will be done in about 20 minutes.

Nutrition Facts
M&M Cookie Bars
Amount Per Serving
Calories 486 Calories from Fat 234
% Daily Value*
Fat 26g40%
Saturated Fat 9g56%
Cholesterol 32mg11%
Sodium 518mg23%
Potassium 45mg1%
Carbohydrates 58g19%
Fiber 1g4%
Sugar 39g43%
Protein 4g8%
Vitamin A 820IU16%
Vitamin C 0.2mg0%
Calcium 145mg15%
Iron 1.4mg8%
* Percent Daily Values are based on a 2000 calorie diet.