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+ servings
Monster Cookies bars

Monster Cookies

The best of every cookie recipe rolled into one 'super cookie'. Monster Cookies are full of peanut butter, M&Ms, oats and drizzled with chocolate in an easy cookie bar recipe.
Course Dessert
Cuisine American
Keyword cookie bar recipe, monster cookie recipe, monster cookies
Prep Time 10 minutes
Cook Time 20 minutes
Cooling Time (in refrigerator) 15 minutes
Total Time 45 minutes
Servings 12
Calories 406kcal
Author Toni Dash


  • ¾ cup all-purpose flour regular or gluten-free measure-for-measure blend
  • ½ teaspoon baking soda
  • ¼ teaspoon salt
  • 1 ½ cups old fashioned oats
  • ½ cup unsalted butter room temperature
  • 2/3 cup peanut butter crunchy or smooth
  • ½ cup brown sugar
  • 1/3 cup granulated sugar
  • 1 large egg
  • ½ teaspoon vanilla extract
  • 1 cup mini M&M’s plus more for garnish
  • ½ cup chocolate chips


  • Preheat oven to 350 degrees.
  • Line a 9x9 inch square pan with parchment paper or foil.
  • In a bowl, whisk together flour, baking soda, salt, and oats; set aside.
  • In a large bowl, cream together butter, peanut butter, and sugars until light and smooth, about 3 minutes.
  • Add egg and vanilla extract and beat for an additional 2 minutes.
  • With the standing mixer or beaters running on low, gradually add the flour mixture, mixing only until just combined. Stir in M&M’s.
  • Evenly press dough into the prepared pan. Bake bars for 18-20 minutes or until edges are golden and a toothpick is inserted into the center and comes out clean. Cool completely.
  • Place the chocolate chips in a small microwave safe bowl. Microwave on 50% power for 45 second intervals until the chocolate chips are melted; whisk until smooth.
  • Drizzle melted chocolate over bars and garnish with M&M’s. Let chocolate drizzle harden for about 30 minutes at room temperature or refrigerate for 15 minutes before slicing.
  • Cut bars into 9 large squares or 12 mini squares.



Calories: 406kcal | Carbohydrates: 47g | Protein: 7g | Fat: 22g | Saturated Fat: 10g | Cholesterol: 38mg | Sodium: 186mg | Potassium: 155mg | Fiber: 3g | Sugar: 31g | Vitamin A: 312IU | Vitamin C: 1mg | Calcium: 53mg | Iron: 1mg