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Monster cookies on a baking sheet.
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Monster Cookies

Monster Cookies are BIG chewy cookies loaded with peanut butter, oats, M&Ms, and chocolate chips. Sweet and nutty, they're a classic cookie recipe the whole family will love!
Prep Time12 minutes
Cook Time13 minutes
Total Time25 minutes
Course: Dessert
Cuisine: American
Keyword: cookies, cookies, m&m cookies, holiday baking, monster cookies
Servings: 28 cookies
Calories: 174kcal


  • Baking sheet
  • Stand mixer
  • Mixing bowl
  • Cookie scoop


  • ½ cup unsalted butter softened
  • 1 cup light brown sugar packed
  • ¾ cup creamy peanut butter
  • 1 large egg room temperature
  • 2 teaspoon vanilla extract
  • 1 teaspoon baking soda
  • 1 ¼ cups all-purpose flour
  • ½ teaspoon kosher salt
  • ½ cup quick oats
  • ¾ cup M&Ms
  • ½ cup bittersweet chocolate chips


  • Preheat the oven to 350℉. Line a baking sheet with parchment or a silicon mat.
  • In the bowl of an electric mixer fitted with a paddle, cream together the butter, sugar, and peanut butter until fluffy, about 3-4 minutes. Add the egg and vanilla and continue to mix, scraping the sides as needed.
    ½ cup unsalted butter, 1 cup light brown sugar, ¾ cup creamy peanut butter, 1 large egg, 2 teaspoon vanilla extract
  • In a separate bowl, combine the baking soda, flour, and salt and stir to mix. With the speed on low, slowly add the dry ingredients to the bowl and mix until just combined. Do not overmix. Add the oats, M&Ms, and chocolate chips and mix until just combined.
    1 teaspoon baking soda, 1 ¼ cups all-purpose flour, ½ teaspoon kosher salt, ½ cup quick oats, ¾ cup M&Ms, ½ cup bittersweet chocolate chips
  • Spoon 2 tablespoon portions of dough onto the prepared baking sheet, leaving 2-inches in between each one. Bake for 11-13 minutes or until the edges are golden brown. Gently press down on the top of each cookie with the back of a spoon to flatten. Allow to cool on the baking sheet for 10 minutes. Transfer the cookies to a wire rack to finish cooling.


Serving: 1serving | Calories: 174kcal | Carbohydrates: 20g | Protein: 3g | Fat: 9g | Saturated Fat: 5g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 3g | Trans Fat: 0.1g | Cholesterol: 15mg | Sodium: 123mg | Potassium: 84mg | Fiber: 1g | Sugar: 13g | Vitamin A: 123IU | Vitamin C: 0.05mg | Calcium: 30mg | Iron: 1mg