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A close-up of chewy Monster Cookies filled with oats, peanut butter, chocolate chips, and colorful Peanut M&Ms.

The Best Monster Cookies Recipe

Monster Cookies are packed with oats, peanut butter, chocolate chips, and Peanut M&Ms, creating a chewy, colorful treat that's perfect for any occasion. Easy to make and irresistibly delicious!
Prep Time 15 minutes
Cook Time 15 minutes
Total Time 30 minutes
Course Cookie Plate
Cuisine American
Servings 40 Cookies

Ingredients
  

  • 6 Eggs
  • 2 Cups Brown Sugar
  • 2 Cups Sugar
  • 2 Sticks Butter – Softened
  • 3 Cups Creamy Peanut Butter
  • 1/2 Tbsp Light Corn Syrup
  • 1/2 Tbsp Vanilla
  • 4 tsp Baking Soda
  • 5 Cups Oats
  • 12 oz. Chocolate Chips
  • 16 oz. Peanut M&M’s

Instructions
 

  • Preheat oven to 350°.
  • Cream butter and sugars in stand mixer. Add eggs and mix well.
  • Add peanut butter, corn syrup, and vanilla, combining thoroughly and getting rid of any clumps of PB.
  • Sprinkle in the baking soda and give it a good mix.
  • Add oats, one cup at a time, mixing thoroughly between each addition. Your mixing bowl will start to get quite full.
  • Stir in chocolate chips.
  • Spoon batter onto parchment-lined cooke sheets, leaving a couple inches between each dough ball.
  • Add 2 or 3 Peanut M&M’s to each dough ball so they’re pretty on top.
  • Bake for 13 – 15 minutes. Allow to cool for 5 minutes before transferring them to a wire cooling rack.
Keyword M&M, oatmeal, Peanut Butter