Costco Marshmallow Crispy Cookies Recipe
Introduction
These Costco Marshmallow Crispy Cookies combine the best of chewy marshmallows and crunchy Rice Krispies for a delightful treat. Perfectly soft with a hint of crispness, they’re a crowd-pleaser for any occasion.

Ingredients
- 1 cup unsalted butter
- 1 cup brown sugar
- 1/2 cup granulated sugar
- 2 teaspoons vanilla extract
- 1 large egg
- 1 3/4 cups all-purpose flour
- 1/2 teaspoon baking soda
- 1/2 teaspoon salt
- 1 1/2 cups mini marshmallows
- 1 1/2 cups Rice Krispies cereal
Instructions
- Step 1: Cream the butter, brown sugar, and granulated sugar until light and fluffy.
- Step 2: Mix in the egg and vanilla extract until combined.
- Step 3: In a separate bowl, whisk together flour, baking soda, and salt.
- Step 4: Gradually add the dry ingredients to the wet mixture and mix just until combined.
- Step 5: Gently fold in mini marshmallows and Rice Krispies cereal.
- Step 6: Chill the dough for at least 30 minutes.
- Step 7: Scoop 2-tablespoon-sized dough balls onto a parchment-lined baking sheet.
- Step 8: Bake at 350°F (175°C) for 10–12 minutes until edges are golden and centers are slightly underbaked.
- Step 9: Let cookies cool for 5 minutes on the baking sheet before transferring to a rack.
- Step 10: Serve warm or store once fully cooled.
Tips & Variations
- For extra chewiness, use brown butter instead of regular melted butter.
- Try adding chopped nuts like pecans or walnuts for added crunch.
- If mini marshmallows are hard to fold in, briefly freeze them to prevent melting into the dough.
- Use gluten-free flour blend to make this recipe gluten-free.
Storage
Store cooled cookies in an airtight container at room temperature for up to 5 days. To keep marshmallows fresh, avoid refrigeration as it can make them sticky. Reheat briefly in the microwave for a warm, gooey treat.
How to Serve

Serve this delicious recipe with your favorite sides.
FAQs
Can I freeze the cookie dough?
Yes, you can freeze the dough balls on a baking sheet, then transfer to a freezer bag. Bake from frozen, adding a couple of extra minutes to the baking time.
Why are my marshmallows melting during baking?
Marshmallows soften and melt naturally in the oven. To keep their shape, chill the dough well before baking and avoid overbaking the cookies.
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Costco Marshmallow Crispy Cookies Recipe
- Total Time: 57 minutes
- Yield: 20 servings 1x
Description
These Costco-inspired Marshmallow Crispy Cookies combine the chewy texture of marshmallows with the crunch of Rice Krispies cereal, creating a delightful treat with a perfect balance of sweetness and texture. Ideal for cookie lovers looking for a fun twist on classic cookies.
Ingredients
Wet Ingredients
- 1 cup unsalted butter
- 1 cup brown sugar
- 1/2 cup granulated sugar
- 2 teaspoons vanilla extract
- 1 large egg
Dry Ingredients
- 1 3/4 cups all-purpose flour
- 1/2 teaspoon baking soda
- 1/2 teaspoon salt
Add-ins
- 1 1/2 cups mini marshmallows
- 1 1/2 cups Rice Krispies cereal
Instructions
- Cream the sugars and butter: In a large bowl, beat the unsalted butter with brown sugar and granulated sugar until the mixture is light and fluffy, creating a smooth base for the cookie dough.
- Add egg and vanilla: Mix in the large egg and vanilla extract until fully combined, ensuring the wet ingredients are well incorporated.
- Combine dry ingredients: In a separate bowl, whisk together the all-purpose flour, baking soda, and salt to evenly distribute the leavening agents and seasoning.
- Mix dry into wet: Gradually add the dry ingredient mixture to the wet ingredients, stirring just until combined to avoid overmixing and developing too much gluten.
- Fold in marshmallows and cereal: Gently fold mini marshmallows and Rice Krispies cereal into the cookie dough to evenly distribute the add-ins without crushing them.
- Chill the dough: Cover the dough and refrigerate for at least 30 minutes to firm it up, which helps the cookies keep their shape while baking.
- Scoop dough balls: Using a tablespoon or cookie scoop, portion out 2-tablespoon-sized balls of dough onto a parchment-lined baking sheet, spacing them evenly apart.
- Bake the cookies: Bake in a preheated oven at 350°F (175°C) for 10–12 minutes until the cookie edges are golden brown and the centers are still slightly soft and underbaked for a chewy texture.
- Cool on baking sheet: Let the cookies cool on the baking sheet for 5 minutes to firm up before transferring them to a wire rack to cool completely.
- Serve and store: Enjoy the cookies warm or allow them to fully cool before storing in an airtight container to maintain freshness.
Notes
- Chilling the dough is crucial for maintaining cookie shape and enhancing flavor.
- Do not overbake; cookies should remain soft in the center for the best texture.
- Use mini marshmallows to ensure even distribution with the Rice Krispies cereal.
- If you prefer less sweetness, adjust the sugar quantities slightly or try different types of sugars, such as coconut sugar.
- Store cookies in an airtight container at room temperature for up to 5 days.
- Prep Time: 15 minutes
- Cook Time: 12 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
Keywords: Costco, Marshmallow Cookies, Crispy Cookies, Rice Krispies, Dessert, Easy Cookies, Snack

