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+ servings
a stack of monster cookies.
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4.75 from 4 votes

Monster Cookies

These Monster Cookies take all of your favourite cookie components and combine them into one "Monster" creation! Peanut butter, oats, chocolate chips and m&ms make up this sweet treat.
Prep Time15 mins
Cook Time12 mins
Total Time27 mins
Course: Cookies, Dessert
Cuisine: American
Servings: 36
Calories: 213kcal


  • ½ cup butter unsalted, softened
  • 1 cup brown sugar
  • 1 cup sugar granulated
  • 1 ½ cup peanut butter
  • 2 large eggs
  • 1 tsp baking soda
  • 1 tsp baking powder
  • 1 tsp vanilla extract
  • 4 ½ cups quick-cooking oats
  • ¾ cup mini M&Ms
  • ¾ cup chocolate chips


  • Preheat the oven to 350F.
  • Add the butter, brown sugar, and granulated sugar to a large mixing bowl. Beat until light and creamy. Add the peanut butter, eggs, baking soda, baking powder, and vanilla. Continue to beat until smooth.
  • Add the oats, M&Ms, and chocolate chips to the bowl. Use a spatula or wooden spoon to mix everything together until well combined.
  • Line 2 baking sheets with parchment paper. Use a cookie scoop, ice cream scoop, or 1/4 cup measure to scoop the cookie dough onto the sheet, giving them room to spread.
  • Bake the cookies for 10-12 minutes, or just until the edges begin to brown. Let the cookies cool fully on the sheet.


  1. To help your cookies stay fresh, store them in an airtight container at room temperature for about 3-4 days. After that, it's best to freeze them!
  2. Freezing: After your monster cookies have cooled completely. Place them in a single layer on a parchment-lined baking sheet to freeze them (this will help them not stick together in the bag), then store them in a freezer-safe zip-top storage bag . Squeeze out extra air and place flat in the freezer for up to 3 months


Serving: 1cookie | Calories: 213kcal | Carbohydrates: 26g | Protein: 5g | Fat: 11g | Saturated Fat: 4g | Cholesterol: 18mg | Sodium: 114mg | Potassium: 132mg | Fiber: 2g | Sugar: 18g | Vitamin A: 112IU | Vitamin C: 1mg | Calcium: 32mg | Iron: 1mg