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๐Ÿฅ˜Recipes by Nani
Dessert

The Best Monster Cookies

These monster cookies are packed with creamy peanut butter, oats, and plenty of colorful chocolate candies for the perfect treat.

By Recipes By Naniยท ๐ŸŒ Americanยท October 23, 2026
The Best Monster Cookies
recipesbynani.com
Prep
15 minutes
Cook
12 minutes
Total
27 minutes
Serves
24 cookies

If you cannot decide between a peanut butter cookie and an oatmeal cookie, this recipe is for you. These cookies are thick, chewy, and loaded with everything that makes a cookie delicious. They are always a hit with kids and adults alike at bake sales or family gatherings.

My top tip for this recipe is to make sure your butter is softened to room temperature before you start. This helps the sugars cream together properly so the cookies have the right texture. Do not overbake them, as they should stay soft in the middle.

๐Ÿงบ Ingredients

  • 1 cup creamy peanut butter
  • 1/2 cup unsalted butter, softened
  • 1 cup brown sugar, packed
  • 1/2 cup granulated sugar
  • 2 large eggs
  • 1 teaspoon vanilla extract
  • 1/2 teaspoon baking soda
  • 3 cups old fashioned rolled oats
  • 1/2 cup all purpose flour
  • 1 cup semi sweet chocolate chips
  • 1 cup milk chocolate M&Ms

๐Ÿ‘ฉโ€๐ŸณInstructions

  1. 1

    Preheat your oven to 350 degrees Fahrenheit and line a large baking sheet with parchment paper.

  2. 2

    In a large bowl, cream together the peanut butter, softened butter, brown sugar, and granulated sugar until smooth.

  3. 3

    Add the eggs and vanilla extract to the bowl and beat until the mixture is well combined.

  4. 4

    Stir in the baking soda and the flour until just mixed.

  5. 5

    Gently fold in the rolled oats, chocolate chips, and M&Ms using a sturdy spatula.

  6. 6

    Scoop rounded tablespoons of dough onto your prepared baking sheet, spacing them about two inches apart.

  7. 7

    Bake for 10 to 12 minutes or until the edges are golden brown but the centers still look soft.

  8. 8

    Let the cookies cool on the baking sheet for five minutes before moving them to a wire rack to finish cooling.

๐Ÿ’ก Tips

Store these cookies in an airtight container at room temperature for up to five days. If you want to keep them longer, you can freeze the baked cookies for up to three months. To get perfectly round edges, place a large circular cookie cutter over each warm cookie and swirl it gently immediately after pulling them from the oven.

Made this recipe? Let us know how it went.

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