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Chocolate M&M Bars on a plate.
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5 from 4 votes

Chocolate M&M Cookie Bars

These Chocolate M&M Cookie Bars are a quick and easy treat packed with chocolate and bright M&M's! Fun and delicious bars that need to happen in your kitchen!
Prep Time10 mins
Cook Time20 mins
Total Time30 mins
Course: Dessert
Cuisine: American
Keyword: cookie bars
Servings: 12 squares
Calories: 301kcal
Author: Anna


  • 1/2 cup unsalted butter melted, 1 stick
  • 1/4 cup granulated sugar
  • 3/4 cup packed light brown sugar
  • 1 large egg room temperature
  • 1/2 teaspoon pure vanilla extract
  • 1.75 cup all-purpose flour
  • 1/4 cup unsweetened cocoa powder
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1 Tablespoon cornstarch
  • 1 cup semi-sweet chocolate chips
  • 1/2 cup chocolate M&M's


  • Preheat oven to 350 degrees F.
  • Line 13" x 9" baking pan with parchment paper. Set aside.
  • In a medium mixing bowl, whisk together the dry ingredients (flour, cocoa powder, baking soda, salt and cornstarch).
  • In a large mixing bowl, combine melted butter and both sugars and whisk well. Whisk for about 2 minutes to give the sugar a chance to start dissolving.
  • Add vanilla and egg and whisk until smooth.
  • Add dry ingredients and chocolate chips to butter mixture and stir with a spatula until a uniform dough forms.
  • Press dough into prepared pan. Sprinkle M&M's over dough and press gently.
  • Bake bars for 18 to 20 minutes or until the dough appears dry on top.
  • Cool in pan for 10 minutes, transfer onto cutting board. Cool completely, cut and serve.
  • Store in air tight container for up to 5 days.


  1. Please note, that the nutrition value can vary depending on what product you use. The information below is an estimate. Always use calorie counter you are familiar with.
  2. Bake the bars ina  8" square pan for thicker squares.


Calories: 301kcal | Carbohydrates: 41g | Protein: 3g | Fat: 14g | Saturated Fat: 8g | Cholesterol: 34mg | Sodium: 200mg | Potassium: 155mg | Fiber: 2g | Sugar: 23g | Vitamin A: 265IU | Calcium: 30mg | Iron: 2.2mg