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an up close photo of the inside of a peanut butter monster cookie
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Peanut Butter Monster Cookies

These Peanut Butter Monster Cookies are just as extreme as they sound! Packed with mini M&Ms, chocolate chips, chopped peanuts, quick oats and creamy smooth peanut butter. It's a lot, but in the best way possible!
Course Dessert
Cuisine American
Prep Time 10 minutes
Cook Time 12 minutes
Cooling time 15 minutes
Total Time 37 minutes
Servings 6 large cookies
Calories 840kcal

Ingredients

  • 1 cup All-Purpose Flour
  • 1 cup Cake Flour
  • 1 tsp. cornstarch
  • 1/2 tsp. baking soda
  • 1/2 tsp. baking powder
  • 1/2 tsp. salt
  • 8 Tbsp. unsalted butter, cold, cut into cubes
  • 1/2 cup brown sugar, packed
  • 1/4 cup granulated sugar
  • 3/4 cup creamy peanut butter
  • 1 large egg
  • 1 large egg yolk
  • 1 tsp. vanilla extract (but I always add a liiiittle extra)
  • 1/2 cup mini M&Ms
  • 1/2 cup chocolate chips, semi-sweet
  • 1/2 heaping cup quick oats
  • 1/2 cup chopped peanuts
  • 1 Tbsp. Flaky sea salt (for sprinkling on top of cookies)

Instructions

  • Preheat the oven to 400°F.
  • Whisk together the dry ingredients in a large bowl: All-Purpose flour, cake flour, corn starch, baking soda, baking powder and salt. Set aside.
    1 cup All-Purpose Flour, 1 cup Cake Flour, 1 tsp. cornstarch, 1/2 tsp. baking soda, 1/2 tsp. baking powder, 1/2 tsp. salt
  • Using a stand mixer fitted with the paddle attachment, cream together the butter and sugars until light and fluffy, about 3-4 minutes.
    8 Tbsp. unsalted butter, cold, cut into cubes, 1/2 cup brown sugar, packed, 1/4 cup granulated sugar
  • Add in the creamy peanut butter, then add in the egg, egg yolk and vanilla extract. (In that order).
    3/4 cup creamy peanut butter, 1 large egg, 1 large egg yolk, 1 tsp. vanilla extract (but I always add a liiiittle extra)
  • Gradually add in the dry ingredients followed by the M&Ms, chocolate chips, quick oats and chopped peanuts. Mix just until combined. Turn off the machine.
    1/2 cup mini M&Ms, 1/2 cup chocolate chips, semi-sweet, 1/2 heaping cup quick oats, 1/2 cup chopped peanuts
  • Form the dough into 6 large dough balls and place on a cookie sheet. You can use a silicone baking mat or parchment paper if you prefer.
  • Flatten each dough ball slightly with your fingers, and sprinkle a little flaky sea salt on top of each cookie and a couple mini M&Ms, if you're feeling extra.
    1 Tbsp. Flaky sea salt (for sprinkling on top of cookies)
  • Bake for 10-12 minutes, or until tops of cookies are golden brown. Ovens may vary. Top with more chocolate chips when they come out of the oven, if desired.
  • Cool on the baking sheet for 15 minutes then transfer to a cooling rack to cool completely.*

Video

Notes

  • Let the cookies rest: If your cookies are turning out too gooey, let them rest longer. They are even better if you let them sit and enjoy the next day. Your cookies aren’t ruined, just let them rest!
  • I love using the mini M&Ms because you get more chocolate in each bite, but you can use any M&Ms you prefer.
  • Make the cookies smaller, and adjust baking time as needed.

Nutrition

Serving: 1large | Calories: 840kcal | Carbohydrates: 89g | Protein: 19g | Fat: 48g | Saturated Fat: 20g | Polyunsaturated Fat: 8g | Monounsaturated Fat: 15g | Trans Fat: 1g | Cholesterol: 109mg | Sodium: 648mg | Potassium: 387mg | Fiber: 5g | Sugar: 49g | Vitamin A: 651IU | Vitamin C: 1mg | Calcium: 123mg | Iron: 3mg