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Monster Cookie Bars

Monster Cookie Bars are a chocolatey, peanut butter, oatmeal cookie in bar form and stuffed with M&Ms. If you’ve never tried Monster Cookies before, these might just be your new favorites.

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Squares of cookie bars on the counter with text on the photo that reads "Monster Cookie Bars" in rainbow letters.

Monster Cookie Bar Recipe

I love baking cookie bars because they are a bit faster to make than regular cookies. This is because you don’t have to roll the dough into balls; you just press it straight into a baking pan and then cut the bars into your desired size after baking. This makes cookie bars great for serving to large groups.

Monster cookie dough pressed into a pan with parchment paper.

Ingredients for Monster Cookies Bars

  • Salted Butter (softened) – I always used salted butter. If you only have unsalted, just add an extra pinch of salt to the dough.
  • Peanut Butter – I use creamy peanut butter for this recipe, but you could definitely use crunchy peanut butter, if you prefer. I personally haven’t tested this recipe with natural peanut butter so I’m not sure how it would affect the texture.
  • Brown Sugar – Be sure to always pack your brown sugar when measuring.
  • Granulated Sugar
  • Egg
  • Vanilla
  • All Purpose Flour
  • Oats – Make sure you use old fashioned rolled oats, not quick oats.
  • Baking Soda
  • Baking Powder
  • Salt
  • Semi Sweet Chocolate Chips – Feel free to use milk chocolate chips if you prefer.
  • M&Ms – I like to use a mix of regular M&Ms and mini M&Ms.
Baked cookie bars with M&Ms that are laying on parchment paper and cut into squares.

How to Make Monster Cookie Bars

  1. Begin by lining a 9×9 pan with parchment paper, then set aside.
  2. Prepare the oven by preheating it 350°F.
  3. In the bowl of a stand mixer, or using a handheld electric mixer, cream together the butter, peanut butter, brown sugar and granulated sugar until smooth and creamy.
  4. Next, add the eggs and vanilla and mix until well combined.
  5. Then, add the flour, oats, baking soda, baking powder and salt and mix until a sticky dough forms.
  6. Lastly, mix in the chocolate chips and M&Ms until evenly distributed throughout the dough.
  7. Next, pour the dough into your prepared baking pan.
  8. Use clean hands to loosely press and pack the dough into the pan.
  9. Bake at 350°F for 25-30 minutes or until the top of the bars are golden brown.
  10. After baking, allow the cookie bars to cool completely before removing from the pan and cutting.
  11. Enjoy!
  12. Store your Monster Cookie Bars in an airtight container for 3-4 days at room temperature.
Side view of chocolatey cookie bars on parchment paper with M&Ms sprinkled on the counter.

What are Monster Cookies made of?

Monster Cookies are a combination of many flavors – peanut butter, oats, vanilla, chocolate and (the best part), M&M’s!

Why are my Monster Cookie bars falling apart?

If your cookie bars are dry and falling apart, this usually means they were over baked. Try cooking them for a few less minutes next time.

How to store and freeze cookie bars:

Always allow your cookie bars to cool completely before storing. If you want to freeze the cookie bars, freeze the cut cookie bars in an airtight container for up to 3 months. Before eating, allow the frozen bars to come to room temperature by placing them on the counter for about an hour.

Up close monster cookie bars cut into squares on the counter.

Recipes Similar to Monster Cookie Bars

Monster Cookie Bars cut into squares on the counter.

Monster Cookie Bars

Monster Cookie Bars are a chocolatey, peanut butter, oatmeal cookie in bar form and stuffed with M&Ms. If you've never tried Monster Cookies before, these might just be your new favorites.
4.60 from 15 votes
Print Pin Rate
Prep Time: 15 minutes
Cook Time: 30 minutes
Cool Time: 1 hour
Servings: 16
Calories: 290kcal

Ingredients

  • 1/2 cup salted butter softened
  • 1/4 cup peanut butter
  • 1 cup brown sugar
  • 1/4 cup granulated sugar
  • 2 eggs
  • 2 tsp vanilla extract
  • 2 cups all purpose flour
  • 1 cup rolled oats
  • 1 tsp baking soda
  • 1/2 tsp baking powder
  • 1/2 tsp salt
  • 1 cup semi sweet chocolate chips
  • 3/4 cup m&m's

Instructions

  • Line a 9×9 pan with parchment paper and set aside.
  • Preheat oven to 350° F
  • .Cream together the butter, peanut butter, brown sugar and granulated sugar until smooth and creamy.
  • Add the eggs and vanilla. Mix until well combined.
  • Add the flour, oats, baking soda, baking powder and salt. Mix until a sticky dough forms.
  • Lastly, mix in the chocolate chip sand m&m’s.
  • Pour the mixture into the prepared pan and loosely press and pack the dough into the pan.
  • Bake at 350° for 25-30 minutes or until the tops are golden brown.
  • Allow the cookie bars to cool completely before removing from the pan and cutting.
  • Enjoy!
  • Store in an airtight container for 3-4 days at room temperature.
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Nutrition

Calories: 290kcal | Carbohydrates: 39g | Protein: 5g | Fat: 13g | Saturated Fat: 7g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 4g | Trans Fat: 0.2g | Cholesterol: 36mg | Sodium: 231mg | Potassium: 150mg | Fiber: 2g | Sugar: 21g | Vitamin A: 213IU | Calcium: 38mg | Iron: 2mg

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