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monster cookies piled on a white plate with a red and white cloth napkin in the backgroun
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5 from 5 votes

Monster Cookies

These easy Monster Cookies are packed with peanut butter, oats, chocolate chips and M&M's so every bite is a flavour explosion!
Prep Time10 mins
Cook Time15 mins
Total Time25 mins
Course: Cookies, Dessert
Cuisine: American
Keyword: monster cookies, peanut butter cookies
Servings: 24
Calories: 365kcal



  • Preheat oven to 350 degrees F.
  • Line two cookie sheets with parchment paper. Set aside.
  • Cream peanut butter, butter, and sugars together in a stand mixer. Or use a bowl and hand mixer.
  • Add the eggs and vanilla to the mixing bowl and mix again.
  • Next, add the oats, flour, baking soda, baking powder and salt, combine thoroughly.
  • Add the chocolate chips and ¾ cup of the M&M's to the dough. Stir with a spoon this time so the chocolate stays in whole pieces. Be sure to reserve ¼ cup of the M&M's to press into the tops of the cookies once they are baked.
  • Form heaping tablespoons of dough into balls, place on parchment lined baking sheet.
  • Now flatten them a little bit.
  • Bake in the preheated 350 degrees F oven for 12 - 15 minutes.
  • Remove from oven, and press the rest of the M&M's into the tops of the cookies.
  • Use a spatula to slide the baked cookies onto a wire rack and allow them to cool completely.
  • Serve with a big old Monster cookie loving smile!


Calories: 365kcal | Carbohydrates: 47g | Protein: 6g | Fat: 18g | Saturated Fat: 9g | Cholesterol: 38mg | Sodium: 238mg | Potassium: 143mg | Fiber: 2g | Sugar: 28g | Vitamin A: 295IU | Vitamin C: 1mg | Calcium: 49mg | Iron: 2mg