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a pile of monster cookies on a cooling rack
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Monster Cookies Recipe

Monster cookies are peanut butter oatmeal cookies that have M&M candies in them AND chocolate chips. Seriously, this cookie has it ALL and everyone loves them!
Prep Time20 mins
Cook Time10 mins
Total Time1 hr 20 mins
Course: Cookies, Dessert
Cuisine: American
Servings: 36
Calories: 131kcal


  • 1 cup butter
  • 1 cup smooth peanut butter
  • ½ cup granulated sugar
  • 1 cup brown sugar
  • 2 large eggs
  • 2 teaspoons vanilla
  • 1 ½ cups all purpose flour
  • 1 cup old fashioned oatmeal
  • 1 teaspoon baking soda
  • ½ teaspoon salt
  • 1 cup chocolate chips semi-sweet or milk chocolate
  • 1 cup MM candies


  • In a large mixing bowl add the butter and peanut butter together and beat well until combined.
  • Add the granulated sugar and brown sugar and beat until well creamed.
  • Add the eggs and vanilla and mix to combine.
  • Add the flour, oatmeal, baking soda, and salt to the bowl and stir to combine.
  • Add the chocolate chips and chocolate candies and stir to combine.
  • Cover and chill the dough for 20 minutes or as long as overnight.
  • Preheat the oven to 350 degrees F. and line a baking sheet with parchment or a baking mat.
  • Form the dough into balls that are 2 tabelspoons and place on the cookie sheet about 2 inches apart. You can add a few more candies or chocolate chips to the top of the cookie ball to make them a little prettier if you'd like.
  • Bake until the edges are lightly browned and the center set, 12-15 minutes.
  • Remove from the oven and allow to rest on the baking sheet for minutes before placing them on a wire rack to finish cooling.


This recipe works best with a thicker peanut butter that isn't too drippy. I recommend not using a natural peanut butter and if you do, make sure it's well stirred and not too drippy.


Calories: 131kcal | Carbohydrates: 16g | Protein: 3g | Fat: 7g | Saturated Fat: 2g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 2g | Trans Fat: 0.01g | Cholesterol: 12mg | Sodium: 110mg | Potassium: 63mg | Fiber: 1g | Sugar: 10g | Vitamin A: 37IU | Vitamin C: 0.03mg | Calcium: 21mg | Iron: 1mg