Costco Peanut Butter Monster Cookies Copycat

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Costco’s newest cookie is super popular! Here is how to make it!

Ingredients

  • ½ cup (1 stick or 113g) unsalted butter, at room temperature

  • ¾ cup creamy peanut butter

  • ½ cup (100g) granulated sugar

  • ½ cup (100g) brown sugar

  • 1 large egg + 1 large egg yolk

  • 1 teaspoon vanilla

  • 2 cups (200g) old fashioned oats

  • ½ teaspoon baking soda

  • ¼ teaspoon salt

  • ½ cup (100g) dark or semi-sweet chocolate chips

  • ⅔ cup (145g) M&Ms

Instructions

 

  • Preheat oven to 350°F. Line 2 baking sheets with parchment paper or a silicone mat.

  • In the bowl of a stand mixer fitted with a paddle attachment, cream the butter, peanut butter, sugar, and brown sugar until fluffy and light in color, about 1-2 minutes.

  • Scrape the bowl then add the eggs and vanilla. Mix until well combined. Scrape the bowl again.

  • Add the oats, baking soda, and salt and mix until combined.

  • Using a rubber spatula, fold in the chocolate chips and M&Ms, reserving some of each for the tops of the cookies.

  • With a 3 Tablespoon (size 24 or 1.33 oz.) cookie scoop, portion the cookies onto the prepared baking sheets, spacing them about 2 inches apart. Add a few pieces of the reserved chocolate chips and M&Ms on top of each scoop.

  • Bake the cookies for about 12 minutes, until the edges start to turn golden brown.

  • Allow the cookies to cool and enjoy!