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Monster Cookie Bars - Classic Cookies in easy bar recipe form.
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4.28 from 11 votes

Monster Cookie Bars

These monster cookie bars have all the peanut buttery, chocolatey, chewy goodness of the traditional cookie, only in super easy bar form.
Prep Time15 minutes
Cook Time15 minutes
Additional Time1 hour
Total Time1 hour 30 minutes
Cuisine: American
Servings: 2 dozen bars
Calories: 194kcal


  • ½ cup butter softened
  • 1 cup brown sugar
  • ½ cup peanut butter
  • 2 eggs
  • 1 tsp vanilla
  • cup all purpose flour
  • 1 tsp baking soda
  • cup quick cooking oats
  • ¾ cup semi-sweet chocolate chips
  • 1 cup M&Ms


  • Preheat oven to 350 F. Grease a 9 x 13 pan and set aside.
  • In a large bowl, cream together butter and brown sugar. Beat in peanut butter, eggs and vanilla.
  • In a separate bowl, stir together flour, and baking soda. Add to large bowl and stir until combined. Add oats, chocolate chips and M&Ms.
  • Press into greased pan. Add additional M&Ms to the top, if desired, pressing them into the dough slightly.
  • Bake for 14 - 16 minutes or until edges are slightly brown or until toothpick inserted comes out clean. Do not over bake. Let cool a bit before slicing. Letting them cool completely is best. But its almost impossible to wait that long.


I use salted butter to make this recipe. If you prefer to use unsalted butter, you might want to add a pinch of salt to this recipe.


Serving: 1g | Calories: 194kcal | Carbohydrates: 23g | Protein: 3g | Fat: 11g | Saturated Fat: 5g | Polyunsaturated Fat: 4g | Cholesterol: 27mg | Sodium: 220mg | Fiber: 1g | Sugar: 16g