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Chewy Monster Cookies Recipe with Peanut Butter M&Ms and Oats

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These chewy monster cookies combine creamy peanut butter, old-fashioned oats, and colorful peanut butter M&Ms for a soft, chewy, and fun treat perfect for any occasion.

Ingredients

Scale
  • 1 cup creamy peanut butter
  • 1 cup packed light brown sugar
  • 1/2 cup granulated sugar
  • 2 large eggs, room temperature
  • 1 teaspoon vanilla extract
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 2 cups old-fashioned rolled oats
  • 1 1/2 cups peanut butter M&Ms, roughly chopped

Instructions

  1. Preheat your oven to 350°F (175°C). Line two baking sheets with parchment paper or silicone baking mats.
  2. In a large bowl, beat 1 cup creamy peanut butter, 1 cup packed light brown sugar, and 1/2 cup granulated sugar together until smooth and fluffy, about 2-3 minutes with a mixer.
  3. Beat in 2 large eggs, one at a time, then stir in 1 teaspoon vanilla extract until the batter is glossy and thick.
  4. In a separate bowl, whisk together 1 teaspoon baking soda, 1/2 teaspoon salt, and 2 cups old-fashioned rolled oats.
  5. Gradually fold the oat mixture into the wet ingredients, stirring gently to combine without overmixing.
  6. Fold in 1 1/2 cups roughly chopped peanut butter M&Ms carefully using a spatula.
  7. Using a cookie scoop or tablespoon, drop rounded balls of dough (about 2 tablespoons each) onto the prepared baking sheets, spacing them about 2 inches apart.
  8. Bake for 10-12 minutes until edges start to set but centers remain soft and slightly underbaked.
  9. Let cookies cool on the baking sheet for about 5 minutes before transferring to a wire rack to cool completely.

Notes

Do not overbake to maintain chewiness; chilling dough for 15-20 minutes helps prevent spreading. Use old-fashioned oats for best texture. Fold in M&Ms gently to avoid crushing.

Nutrition

Keywords: monster cookies, chewy cookies, peanut butter M&Ms, oats, easy cookies, chewy monster cookies, peanut butter cookies, colorful cookies

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