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+ servings
stack of m&m cookies

Monster M&M Peanut Butter Cookies

Course Dessert
Cuisine American
A delicious combination of peanut butter, oats, chocolate chips and M&Ms, all in one easy cookie!
Prep Time 20 mins
Cook Time 12 mins
Total Time 1 hr 32 mins
Servings 14 large cookies


  • 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 cups 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


  • In a large mixing bowl, cream the butter and sugar for about 4 minutes or until creamy and pale. Add the vanilla and beat again. Then add the egg and beat until smooth. Add the peanut butter and beat until combined.
  • In a separate bowl, sift the flour, baking soda, cornflour and gently whisk together. Then add the dry ingredients to the wet and gently fold together. Add the rolled oats, M&M's and chocolate chips and stir until combined. 
  • Cover the bowl with plastic wrap and refrigerate for at least one hour.
  • Line two oven trays with baking paper. Preheat the oven to 350 F.
  • Grab cookie dough from the fridge. The dough will still be a bit sticky but it should be firm enough to roll balls using your hands.
  • Line the balls (approximately 1 heaped tablespoon) of cookie dough onto the prepared trays and then flatten slightly using your hand or a spatula, as they wont spread out as much as a normal cookie would. Press a few extra M&M’s and chocolate chips on top if desired.
  • Bake the cookies for approximately 12 minutes or until golden brown on the edges. Leave the cookies to cool slightly before gently moving to a wire rack to cool completely.


Calories: 303kcal | Carbohydrates: 30g | Protein: 6g | Fat: 18g | Saturated Fat: 8g | Cholesterol: 32mg | Sodium: 175mg | Potassium: 172mg | Fiber: 2g | Sugar: 20g | Vitamin A: 239IU | Calcium: 35mg | Iron: 1mg
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