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Marshmallow Crispy Cookies (Costco Copycat) Recipe

4.4 from 71 reviews

These Marshmallow Crispy Cookies are a delightful Costco copycat treat combining the nutty richness of browned butter with the crispy crunch of rice krispies and soft mini marshmallows. Perfectly chewy with a hint of salty flaked salt on top, these cookies offer a unique texture and flavor experience that’s sure to satisfy your sweet tooth.

Ingredients

Scale

Wet Ingredients

  • ½ cup salted butter
  • 1 large egg (room temperature)
  • 1 teaspoon vanilla (vanilla paste preferred)

Sugars

  • ¾ cup brown sugar
  • ½ cup granulated sugar

Dry Ingredients

  • 1 tsp baking soda
  • ¾ tsp salt
  • 1 cup + 2 tbsp all-purpose flour

Add-ins

  • 1½ cups rice krispie cereal
  • ⅔ cup mini marshmallows
  • Flaked salt for topping

Instructions

  1. Preheat oven: Preheat your oven to 350°F (177°C) and line a baking sheet with parchment paper to prevent sticking and ease cleanup.
  2. Brown the butter: Melt ½ cup salted butter in a medium saucepan over medium heat. Continue cooking past boiling, stirring constantly, until the butter turns golden brown and smells nutty. Watch carefully to avoid burning. Once browned, pour into a bowl and cool in the fridge or freezer for about 10 minutes.
  3. Mix butter and sugars: In a medium mixing bowl, combine the cooled browned butter with ¾ cup brown sugar and ½ cup granulated sugar. Add the egg and vanilla paste. Mix on low speed until smooth, about 30 seconds.
  4. Add dry ingredients: Gradually mix in 1 tsp baking soda, ¾ tsp salt, and 1 cup plus 2 tbsp all-purpose flour. Stir carefully to avoid over-mixing, which can make cookies tough.
  5. Fold in cereal and marshmallows: Gently fold in 1½ cups rice krispie cereal followed by ⅔ cup mini marshmallows to the dough, ensuring an even distribution without crushing the marshmallows.
  6. Scoop dough: Use a 3 tablespoon cookie scoop to form large dough balls, placing 4-5 cookies per lined baking sheet to allow space for spreading.
  7. Bake: Bake in the preheated oven for 10-13 minutes, or until edges are lightly golden brown. Avoid overbaking to keep centers chewy.
  8. Finish and cool: Immediately after baking, sprinkle cookies generously with flaked salt. Allow cookies to cool on the baking sheet before transferring to a wire rack.

Notes

  • Cooling the browned butter before mixing helps prevent the eggs from cooking and ensures better dough texture.
  • Use parchment paper for easy cleanup and to prevent sticking.
  • Keep a close eye on the browned butter stage to avoid burning, which can impart a bitter flavor.
  • Do not overbake to maintain chewy centers; remove when edges just turn golden brown.
  • Flaked salt topping contrasts the sweetness and enhances flavors.
  • If desired, mini marshmallows can be slightly chilled before folding to reduce melting during baking.

Keywords: Marshmallow Cookies, Rice Krispie Cookies, Browned Butter Cookies, Chewy Cookies, Costco Copycat, Crispy Cookies