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Chewy Monster Cookies (Peanut Butter)

These Chewy Monster Cookies are packed with peanut butter, M&Ms, chocolate chips, and peanuts for a colorful, irresistible treat!
Prep Time20 minutes
Cook Time12 minutes
Total Time32 minutes
Course: Dessert
Cuisine: American
Keyword: Chewy, Cookies, Easy, Peanut Butter, Quick
Servings: 24 servings

Ingredients

  • 1 cup unsalted butter room temperature
  • 1 cup creamy peanut butter room temperature
  • 2 teaspoons pure vanilla extract
  • 1 and 1/4 cups light brown sugar packed
  • 1/3 cup granulated sugar
  • 2 large eggs room temperature
  • 1 large egg yolk room temperature
  • 1 and 3/4 cups all-purpose flour
  • 3/4 cup old-fashioned oats
  • 1/2 cup quick oats
  • 1 teaspoon baking soda
  • 1 teaspoon baking powder
  • 1/2 teaspoon ground cinnamon
  • 1/2 teaspoon salt
  • 1 and 1/2 cups M&M candies
  • 1 and 1/2 cups semi-sweet chocolate chips
  • 1/2 cup salted peanuts roughly chopped

Instructions

  • Preheat your oven to 350°F (175°C). This step is crucial for achieving the perfect texture.
  • In a large mixing bowl, combine the room temperature unsalted butter and creamy peanut butter. Using an electric mixer, beat them together until the mixture is smooth and creamy.
  • Add the light brown sugar and granulated sugar to the bowl. Beat until well combined and fluffy. Then, mix in the pure vanilla extract for that extra flavor boost.
  • Add the two large eggs and the additional egg yolk, one at a time, mixing well after each addition to ensure they are fully incorporated.
  • In a separate bowl, whisk together the all-purpose flour, old-fashioned oats, quick oats, baking soda, baking powder, ground cinnamon, and salt. Gradually add this dry mixture to the wet ingredients, mixing until just combined.
  • Gently fold in the M&M candies, semi-sweet chocolate chips, and chopped salted peanuts. This is where the "monster" in these cookies comes to life!
  • Using a cookie scoop, portion out the dough onto prepared baking sheets lined with parchment paper. Leave enough space between each cookie for spreading.
  • Bake the cookies in the preheated oven for about 10-12 minutes, or until the edges are lightly golden. The centers may look a bit underbaked, but they will continue to cook as they cool.
  • Remove the baking sheets from the oven and let the cookies cool on them for about 5 minutes before transferring them to a cooling rack. Enjoy your chewy monster cookies warm or at room temperature!

Equipment

  • Mixing Bowls
  • Electric Mixer
  • Baking Sheets
  • Parchment Paper
  • Cookie Scoop
  • Cooling Rack

Notes

  • For chewier cookies, chill the dough for at least 30 minutes before baking.
  • Store cookies in an airtight container at room temperature for up to a week or freeze up to three months.
  • Substitute M&M candies with chocolate chunks or use crunchy peanut butter for texture variations.