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Monster Cookie Recipe

These Monster Cookies are a delightful blend of peanut butter, oats, chocolate, and M&Ms—perfectly chewy and bursting with flavor!
Prep Time15 minutes
Cook Time12 minutes
Total Time27 minutes
Course: Dessert
Cuisine: American
Keyword: Chocolate, Cookies, Easy, Oats, Peanut Butter, Quick
Servings: 24 servings

Ingredients

  • 1/2 cup butter softened
  • 3/4 cup light brown sugar firmly packed, dark also works
  • 1 tsp vanilla extract
  • 1 large egg
  • 3/4 cup creamy peanut butter
  • 1/2 cup all-purpose flour
  • 1/2 tsp baking soda
  • 1 tsp cornstarch
  • 1 cup rolled oats
  • 1/2 cup plain M&Ms
  • 1/2 cup semi-sweet chocolate chips

Instructions

  • Preheat your oven to 350°F (175°C). This ensures that your cookies will bake evenly and come out perfectly golden brown.
  • In a large mixing bowl, combine the softened butter, light brown sugar, and vanilla extract. Use a hand mixer or a whisk to cream these ingredients together until the mixture is light and fluffy.
  • Next, add the large egg and creamy peanut butter to the mixture. Blend them in until completely incorporated, creating a smooth, creamy base.
  • In a separate bowl, whisk together the all-purpose flour, baking soda, cornstarch, and rolled oats. Once mixed, gradually add this dry mixture to your wet ingredients, stirring until just combined.
  • Gently fold in the plain M&Ms and semi-sweet chocolate chips. This is where the fun begins! Make sure the mix-ins are evenly distributed throughout the dough.
  • Using a cookie scoop or tablespoon, drop rounded balls of dough onto your prepared baking sheet, spacing them about 2 inches apart to allow for spreading.
  • Place the baking sheet in the preheated oven and bake for 10-12 minutes, or until the edges are lightly golden. The centers may look slightly underbaked, but they will continue to set as they cool.
  • Remove the cookies from the oven and let them cool on the baking sheet for about 5 minutes before transferring them to a wire rack to cool completely. Enjoy your freshly baked monster cookies with a glass of milk or your favorite beverage!

Equipment

  • Mixing Bowl
  • Measuring Cups and Spoons
  • Baking Sheet
  • Cookie scoop or tablespoon
  • Oven

Notes

  • Customize your mix-ins by swapping M&Ms for raisins, nuts, or shredded coconut for a different twist.
  • Use dark brown sugar for a richer, more robust flavor.
  • For chewier cookies, reduce baking time slightly and enjoy them a bit doughy in the center.
  • Prepare dough ahead of time and refrigerate up to 3 days or freeze dough balls for up to 3 months.