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plate full of monster cookies next to a cup of chocolate chip, oats, and m&ms and a spoon full of peanut butter

Monster Cookies

This easy recipe for monster cookies is perfect to whip up on a whim or with the kids. Full of oats, peanut butter, chocolate chips, and M&M's everyone loves these cookies. Step-by-step photos help you bake the perfect batch each time!

  • Total Time: 20 minutes
  • Yield: 27 Cookies 1x


Units Scale
  • 4oz (1/2 cup) Unsalted Butter, at room temp.
  • 150 grams (3/4 cup) Light Brown Sugar
  • 50 grams (1/4 cup) Granulated Sugar
  • (4oz) 1/2 Cup Peanut Butter, creamy or crunchy
  • 1 Large Egg, at room temperature
  • 2 Teaspoons Pure Vanilla Extract
  • 100 grams (1 Cup) Quick Fashioned Oats
  • 125 grams (1 Cup) All-Purpose Flour
  • 1/2 Teaspoon Baking Soda
  • 1/2 Teaspoon Salt
  • 150 grams (3/4 Cup) M&Ms
  • 90 grams (1/2 Cup) Chocolate Chips


  1. Preheat oven to 350F/180C and line a cookie sheet with a Silpat liner. In a large mixing bowl with a hand held electric whisk or in the bowl of an electric mixer beat butter and sugars for 2 minutes on medium speed.
  2. Scrape down the sides of the bowl then add the peanut butter, mix for an additional one to two minutes. Add in the egg and vanilla extract and mix until fully combined.
  3. In a medium bowl mix together oats, flour, baking soda, and salt. Add dry ingredients, M&M's, and chocolate chips to the wet ingredients and mix until just combined.
  4. Use a medium cookie scoop and place on prepared baking sheet two inches apart. Add more M&M's and chocolate chips on top of each cookie, if desired.
  5. Bake for 8-11 minutes. Until golden brown and just set. Let cool on sheet for 5 minutes then transfer to wire rack. Store in an airtight container for u pto 5 days.
  • Author: Elizabeth Waterson I Confessions of a Baking Queen
  • Prep Time: 10
  • Cook Time: 10
  • Category: Dessert
  • Method: Bake
  • Cuisine: American

Keywords: monster cookie recipe, peanut butter oat cookies, easy monster cookie

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