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A plate of Christmas monster cookies which are decorated with M&M's, white chocolate and sprinkles.

Monster Cookies (Christmas Version)

These monster cookies are the classic oatmeal peanut butter cookies all dressed up for Christmas with red and green M&M's, white chocolate chips and holiday sprinkles. A fun and festive treat for cookie exchanges and gift giving!
Course Dessert
Cuisine American
Prep Time 10 minutes
Cook Time 15 minutes
Total Time 25 minutes
Servings 24
Calories 201kcal
Author Sara Welch


  • 1/2 cup butter softened
  • 3/4 cup brown sugar
  • 1/4 cup granulated sugar
  • 1 egg
  • 1/2 cup creamy peanut butter
  • 1 teaspoon vanilla extract
  • 1 cup all purpose flour
  • 1/2 teaspoon baking soda
  • 1 1/4 cups rolled oats
  • 1 cup holiday M&M's plus more for tops of cookies
  • 1/2 cup white chocolate chips plus more for tops of cookies
  • 1/3 cup holiday sprinkles


  • Preheat the oven to 350°F.
  • Line a sheet pan with a piece of parchment paper or silicon baking mat
  • Place the butter, brown sugar, and granulated sugar in the bowl of a mixer. Beat until light and fluffy, 1-2 minutes.
  • Add the egg, peanut butter and vanilla to the bowl and mix until combined
  • Add the flour and baking soda to the bowl and mix until just combined. Stir in the oats.
  • Add the M&M's and white chocolate chips to the bowl and gently fold them into the dough.
  • Make 2 tablespoon sized balls of cookie dough and place them 2 inches apart on the prepared sheet pan. You will need to bake the cookies in batches.
  • Press the top of each cookie dough ball into the sprinkles.
  • Press a few M&M's and white chocolate chips onto the top of each cookie dough ball.
  • Bake for 11-13 minutes or until edges are lightly browned.
  • Cool the cookies on the pan for 5 minutes, then transfer to a cooling rack
  • Repeat the process with the remaining cookie dough. Cool all cookies completely then serve.
  • Store any leftover cookies in a sealed container for up to 5 days, or you can freeze the cookies for up to 2 months.



Calories: 201kcal | Carbohydrates: 24g | Protein: 3g | Fat: 10g | Saturated Fat: 5g | Cholesterol: 19mg | Sodium: 95mg | Potassium: 78mg | Fiber: 1g | Sugar: 16g | Vitamin A: 145IU | Vitamin C: 0.1mg | Calcium: 31mg | Iron: 0.7mg