Costco Marshmallow Crispy Cookies

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Crackly on the outside, gooey on the inside, and packed with chewy marshmallow bits and crispy rice cereal crunch—Costco Marshmallow Crispy Cookies are the ultimate nostalgic-meets-modern treat. If you’ve ever grabbed a pack of these heavenly bites at Costco and wondered if you could recreate them at home, the answer is a confident YES.

This cookie combines buttery dough with vanilla, golden brown edges, and surprise pockets of melty marshmallow that stretch with every pull-apart. The added crisp from puffed rice makes it more than a cookie—it’s a textural dream for cookie lovers who crave something different yet deeply familiar.

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What Kind of Puff Pastry Should I Use?

Trick question! These aren’t puff pastry-based at all—that golden, crispy edge comes entirely from the butter and sugar combo baking just right with the cereal. No flaky layers here, just chewy-gooey-marshmallow-cookie heaven.

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Ingredients for the Costco Marshmallow Crispy Cookies

• Butter: Provides richness and the classic chewy cookie texture.
• Brown Sugar & White Sugar: A combo of both gives depth and sweetness while helping with the chewy and crispy texture.
• Egg: Binds the ingredients and keeps the cookie tender.
• Vanilla Extract: Boosts all the other flavors with warmth.
• All-Purpose Flour: The sturdy base to hold all those marshmallows and cereal bits.
• Baking Soda: Adds the necessary lift.
• Salt: Balances the sweetness.
• Mini Marshmallows: They melt into gooey centers and crispy edges.
• Rice Krispies Cereal: The crispy crunch that makes this cookie stand out.

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How To Make the Costco Marshmallow Crispy Cookies

Step 1: Cream the Butter and Sugars

Beat together the butter, brown sugar, and granulated sugar until the mixture is light and fluffy. This adds air to the dough, creating that perfect chewy center.

Step 2: Mix in the Wet Ingredients

Add the egg and vanilla extract. Beat until everything is fully incorporated. This step ensures your cookies bake evenly.

Step 3: Combine the Dry Ingredients

Whisk together the flour, baking soda, and salt in a separate bowl. Gradually add to the wet mixture and stir until just combined.

Step 4: Fold in the Goodies

Gently mix in mini marshmallows and Rice Krispies. Be careful not to over-mix or crush the cereal.

Step 5: Chill and Scoop

Chill the dough for about 30 minutes. Then scoop into balls, spacing well apart on a baking sheet.

Step 6: Bake

Bake at 350°F (175°C) for 10–12 minutes, until the edges are golden but the centers are still soft. Cool slightly before eating—or devour warm for maximum marshmallow stretch!

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Storing and Serving Costco Marshmallow Crispy Cookies

These cookies are best enjoyed the day they’re baked when the marshmallows are gooey and the edges crisp. That said, they store well in an airtight container at room temperature for up to 4 days. You can reheat them for 10 seconds in the microwave to bring back that fresh-out-of-the-oven softness.

To freeze, place baked cookies in a single layer on a baking sheet, freeze until firm, and then transfer to a freezer-safe bag. Reheat as needed!

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What to Serve With Costco Marshmallow Crispy Cookies?

1. Hot Chocolate with Whipped Cream

Amp up the cozy factor with a big mug of creamy hot chocolate.

2. Salted Caramel Iced Coffee

The caramel tones complement the gooey sweetness of the marshmallows.

3. Vanilla Ice Cream

Turn these cookies into ice cream sandwiches or crumble over a scoop.

4. Peanut Butter Drizzle

Drizzle warm peanut butter over the top for a sweet-salty combo.

5. Fruit Salad

Balance the sweetness with fresh strawberries, blueberries, or citrus.

6. Chai Latte

The spice in chai adds depth to every chewy bite.

7. Cold Milk (Classic!)

Still undefeated as the best cookie companion.

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Want More Cookie Ideas with a Twist?

If you love these Costco Marshmallow Crispy Cookies, you’ll probably enjoy these other favorites:

• Salted Caramel Pecan Cookies for a deeper caramel crunch.
• Lemon Churro Cookies if you’re craving tangy meets warm spice.
• Twix Cookie Cups for candy lovers who want their cookie to double as dessert.
• The Irresistible Charm of Peanut Butter Candy Corn Cookies if nostalgia’s your flavor.
• Chewy Chocolate Chip Cookie Bars when you want an ooey-gooey batch in bar form.

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📌 Save this recipe to your Pinterest dessert board so you can come back to it any time.

And let me know in the comments how yours turned out. Did your marshmallows melt perfectly? Did you toss in chocolate chips or stick to classic?

I love hearing how others make these recipes their own. Questions are welcome too—let’s help each other bake smarter.

Explore beautifully curated health-boosting drinks and more cookie ideas at ChefAlchemy’s Recipes.

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