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Monster cookies on a cooling rack.

Monster Cookies

  • Author: Shelly
  • Prep Time: 10 minutes
  • Cook Time: 10 minutes
  • Total Time: 2 hours 25 minutes
  • Yield: 36 cookies 1x
  • Category: Dessert
  • Method: Oven
  • Cuisine: American


Ready to try one of the best cookie recipes ever? These Monster Cookies are packed with chocolate chips, M&Ms, oats, and peanut butter; don’t miss out on these chocolate-y homemade cookies!


  • 3/4 cup butter, room temperature
  • 2 cups creamy peanut butter
  • 1 1/2 cups light brown sugar
  • 1 1/2 cups granulated sugar
  • 5 large eggs
  • 1 tablespoon vanilla extract
  • 2 teaspoons baking soda
  • 1 teaspoon kosher salt
  • 3/4 cup all purpose flour
  • 5 1/2 cups rolled (old fashioned) oats
  • 1 cup semi-sweet chocolate chips
  • 1 cup M&Ms
  • Optional – 1/2 cup peanut butter chips and/or 1 cup raisins


  1. In the bowl of your stand mixer fitted with the paddle attachment mix the butter, peanut butter, brown sugar, and granulated sugar together on medium speed for 2 minutes.
  2. Add in the eggs one at a time, vanilla extract, baking soda, and salt and mix until smooth for 1 minute, scraping the sides of the bowl as necessary.
  3. Turn the mixer to low and add in the flour, mixing until combined.
  4. Slowly add in the oats and mix until incorporated.
  5. Stir in the chocolate chips, M&Ms, and other optional add-ins.
  6. Cover the bowl and refrigerate the dough for at least 2 hours.
  7. Preheat oven to 375°F. While the oven is preheating, remove the dough from the refrigerator to take the chill off.
  8. Line your baking sheet with parchment paper. Using a medium (2- tablespoon) cookie scoop, portion out the dough and place 2- inches apart on the baking sheet.
  9. Bake for 10 – 12 minutes, until lightly golden. Allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.


Store airtight at room temperature for up to 3 days.
Freeze dough or baked cookies for up to 30 days. See post about freezing cookie dough for tips.

Keywords: monster cookies, monster cookies recipe, peanut butter oat cookies, easy homemade cookie recipes, chocolate chip m&m cookies, best cookies

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