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+ servings
peanut butter monster bar with a bite taken out of it

Peanut Butter Monster Cookie Bars

Kara
All the flavor and texture of monster cookies, but in quick and easy bar form! Switch out the M&M colors to match any holiday.
5 from 1 vote
Prep Time 20 minutes
Cook Time 30 minutes
Total Time 50 minutes
Course Dessert: Brownies and Bars
Cuisine American
Servings 24 cookies (approximately)
Calories 395 kcal

Ingredients
  

  • 1 cup butter melted and slightly cooled
  • 2 cups brown sugar
  • 2 large eggs
  • 1 cup creamy peanut butter
  • 1 Tbsp vanilla extract
  • 1 ½ cups all purpose flour
  • ½ tsp baking powder
  • 2 ½ cups old-fashioned oats
  • ¾ cup semi-sweet chocolate chips
  • ¾ cup milk chocolate chips divided
  • 1 ½ cups M&M's divided

Instructions
 

  • Melt the butter in the microwave in a large glass bowl; set aside.
  • Spray a 9x13" pan with non-stick cooking spray. (For easier cleanup, line the pan with parchment paper or foil first.) Preheat your oven to 350 degrees.
  • Add the brown sugar to the butter and whisk until smooth. Whisk in the eggs, peanut butter, and vanilla.
  • Stir in the flour, baking powder, oats, semi-sweet chocolate chips, 1/2 cup of the milk chocolate chips, and 1 1/4 cups of the M&M's.
  • Press dough into the prepared pan. Sprinkle the remaining 1/4 cup of chips and 1/4 cup M&Ms on top.
  • Bake at 350° for 28-35 minutes or until barely set in the middle and golden brown around the edges. For soft & chewy bars, it's better to under-bake rather than over baking.
  • Let the bars cool for at least 20 minutes, but they cut more cleanly after they have cooled for an hour or two.

Notes

-If you use crunchy peanut butter, you will need to use an additional 1/3-1/2 cup of peanut butter.

Nutrition

Serving: 1gCalories: 395kcalCarbohydrates: 48gProtein: 6gFat: 21gSaturated Fat: 10gPolyunsaturated Fat: 2gMonounsaturated Fat: 6gTrans Fat: 0.3gCholesterol: 36mgSodium: 136mgPotassium: 180mgFiber: 2gSugar: 33gVitamin A: 288IUVitamin C: 0.1mgCalcium: 58mgIron: 2mg
Keyword monster cookie bars
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