Costco Marshmallow Crispy Cookies

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Soft, chewy, and loaded with gooey marshmallows and crispy rice cereal, these Costco Marshmallow Crispy Cookies deliver the perfect blend of comfort and texture. They taste like a rice crispy treat and a buttery cookie had a baby—golden on the edges, pillowy in the center, and filled with little bursts of crunch and melt-in-your-mouth sweetness.

What makes these stand out from a basic cookie is their playful texture and nostalgic flavor. Instead of just chocolate chips or oats, I fold in rice cereal and mini marshmallows, giving each bite that unmistakable crispy-sweet contrast. It’s a crowd-pleaser, whether you’re making a dessert tray or packing them into lunchboxes.

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What Inspired This Recipe

I first tasted a version of these at a friend’s backyard party—she’d brought a batch on a whim, and they disappeared in ten minutes flat. That chewy-gooey crunch stayed with me, and I knew I had to recreate it with my own spin. I leaned into the nostalgia by keeping the marshmallows and cereal front and center but dialed up the richness and depth with more brown sugar and real butter. This version balances sweet, buttery, and crispy just right. It’s also incredibly easy—no fancy mixer required, no candy thermometer. Just a bowl, a spoon, and a craving for something sweet.

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The Ingredients That Make These Marshmallow Crispy Cookies Work

Every ingredient in these cookies plays a role in texture or flavor—nothing is filler.

Unsalted Butter gives that classic rich base. I use it softened so it creams easily with the sugars and forms a smooth dough.

Brown Sugar adds moisture and a deep, almost toffee-like sweetness that balances the marshmallows perfectly.

Granulated Sugar helps with crisping the edges just slightly while keeping the overall cookie sweet.

Egg binds everything and adds just enough structure without drying out the soft, chewy texture.

Vanilla Extract enhances the sweetness and rounds out the flavor. I don’t skip it, even if it’s just a teaspoon.

All-Purpose Flour gives the dough body. I sift it for even mixing and a lighter crumb.

Baking Soda helps the cookies spread while baking, keeping them from being too puffy.

Salt is essential to balance out all the sweet from the marshmallows and cereal.

Mini Marshmallows melt slightly during baking, creating gooey pockets that taste like pure joy.

Rice Krispies Cereal adds crunch and a fun twist that makes these cookies totally unique.

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How To Make the Costco Marshmallow Crispy Cookies

Step 1: Cream the Butter and Sugars

Start by creaming the softened butter, brown sugar, and granulated sugar together until it’s light and fluffy. This step sets the base for a smooth dough and evenly sweet cookies.

Step 2: Add Egg and Vanilla

Crack in your egg and add the vanilla extract. Mix until everything’s fully incorporated and the batter looks glossy and smooth.

Step 3: Mix the Dry Ingredients

In a separate bowl, whisk together the flour, baking soda, and salt. Slowly add the dry mix into the wet ingredients. Don’t overmix—just enough so no flour streaks remain.

Step 4: Fold in Marshmallows and Cereal

Gently stir in the mini marshmallows and rice cereal. I do this by hand with a silicone spatula to keep the cereal from getting crushed.

Step 5: Scoop and Chill

Scoop the dough into heaping tablespoon-sized mounds onto a baking sheet. Chill the dough in the fridge for at least 30 minutes. This keeps them from spreading too much and gives the marshmallows time to hold their shape a bit.

Step 6: Bake to Golden Perfection

Bake at 350°F (175°C) for 10-12 minutes. You’re looking for light golden edges with soft centers. Let them cool on the sheet for 5 minutes before transferring to a rack.

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Use the Right Sheet Pan for Best Results

I’ve tested these cookies on all kinds of pans—shiny aluminum, nonstick dark metal, and ceramic. The winner? A light-colored aluminum sheet pan lined with parchment. Dark pans brown the bottoms too quickly, and ceramic ones don’t allow enough air circulation, leading to uneven baking. If you use a nonstick pan, reduce the baking time slightly and keep an eye on the bottoms. Parchment paper also helps keep the marshmallows from sticking or caramelizing too much.

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Marshmallows: Gooey Pockets That Can’t Be Skipped

The marshmallows aren’t just for looks—they’re the heart of these cookies. I’ve made them without once when I ran out, thinking the cereal would carry the texture. Huge mistake. They came out dry and flat on flavor. The marshmallows create gooey centers and caramelized edges. To prevent them from melting out completely, I tuck a few inside the dough balls so they’re less exposed to the direct heat.

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Serving Information

• Servings: 24 cookies
• Preparation Time: 15 minutes
• Baking Time: 10-12 minutes per batch
• Total Time: 45 minutes

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Tips for Making the Perfect Costco Marshmallow Crispy Cookies

Let the butter sit at room temperature but don’t melt it—too soft and the cookies will spread too much. I always chill the dough to give the marshmallows a fighting chance against the heat. Don’t overmix the batter after adding the dry ingredients or you’ll end up with tough cookies. And don’t skip the parchment paper—trust me, cleaning melted marshmallow off bare metal is no fun.

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Serving Suggestions

These cookies are flexible and fun to share, making them perfect for all sorts of moments. Some of my favorite ways to serve them:

• After-School Snack Hero: Pair with a glass of cold milk for an old-school treat.
• Party Tray Favorite: Pile them up with brownies and lemon bars for a colorful dessert table.
• Holiday Cookie Swap: Wrap in cellophane bags with a ribbon—they look festive and taste like magic.
• Bake Sale Goldmine: These stand out from the usual chocolate chip lineup and sell fast.
• Campfire-Inspired Dessert: Warm slightly and sandwich with a square of chocolate—s’mores cookie edition.

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Save This Cookie to Your Pinterest Board + Let Me Know How Yours Turn Out!

If you love a sweet treat with a chewy middle and crispy edges, pin this to your Dessert Recipes, Kid-Friendly Snacks, or Holiday Baking boards so you can find it again fast. I’d love to hear if you tried it with a twist—maybe added chocolate chips or drizzled some caramel on top? Drop a comment and share your take!

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