Costco Marshmallow Crispy Cookies

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I’m not exaggerating when I say these Costco Marshmallow Crispy Cookies might just be the most addictive treat to ever come out of my oven. Think of the perfect cookie: crispy edges, soft gooey center, and then imagine that stuffed with toasted rice cereal and melty marshmallow pockets. The combination is outrageously good — it’s a mashup of childhood nostalgia and bakery-level indulgence, all in one bite.

I first tried something similar from a big box of cookies at Costco, and I couldn’t stop thinking about them. That chewy center, the subtle crunch from the crispy cereal, and that sweet gooey pull of melted marshmallow — I knew I had to recreate them at home. And let me tell you, the homemade version is even better. You get more marshmallow, more crunch, and that freshly-baked goodness that just doesn’t come from a box.

Why You’ll Love This Costco Marshmallow Crispy Cookies Recipe

This cookie isn’t your average chocolate chip or oatmeal situation — it’s a texture-lover’s dream. The crispy rice cereal gives it a light crunch, while the marshmallow keeps everything deliciously chewy in the middle. It’s the perfect mix of soft and crispy. Plus, it’s super easy to make with pantry staples and comes together without a fuss. Perfect for parties, bake sales, or just a sweet treat to hoard for yourself (no judgment).

What Kind of Marshmallows Should I Use?

Mini marshmallows work best for this recipe — they melt evenly and give you those gooey pockets without overpowering the dough. You can also chop up regular-sized marshmallows if that’s what you have on hand, but avoid using marshmallow fluff, which tends to disappear into the cookie as it bakes.

Options for Substitutions

• Butter: You can substitute melted coconut oil for a dairy-free version, but expect a slightly different texture.
• Brown Sugar: Light or dark both work — dark brown sugar gives a deeper molasses flavor.
• Crispy Cereal: Any puffed rice cereal will do, but I always reach for Rice Krispies for that classic flavor and crunch.
• Flour: Gluten-free flour blends can be used here with pretty great results — look for a 1:1 baking flour.
• Add-ins: Want to go wild? Add white chocolate chips, toffee bits, or even chopped nuts for extra crunch and sweetness.

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Ingredients for this Costco Marshmallow Crispy Cookies Recipe

• Unsalted Butter: Adds richness and helps create that perfectly soft center.
• Brown Sugar: Provides moisture and a deep caramelized flavor to balance the sweetness.
• Granulated Sugar: Helps achieve the right amount of crispness on the edges.
• Vanilla Extract: Enhances the flavor of the cookie dough.
• Large Egg: Binds the ingredients and adds structure.
• All-Purpose Flour: The backbone of the dough, giving the cookies shape and body.
• Baking Soda: Leavens the cookies, allowing them to rise slightly and spread evenly.
• Salt: Balances sweetness and boosts all the other flavors.
• Mini Marshmallows: Melt into gooey pockets that make the cookies extra chewy.
• Rice Krispies Cereal: Adds a light crunch and iconic texture.

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Step 1: Cream the Butter and Sugars

Start by creaming the unsalted butter, brown sugar, and granulated sugar together in a large mixing bowl until the mixture is light and fluffy. This step is essential for creating a cookie that’s both chewy and crisp in the right places.

Step 2: Add the Egg and Vanilla

Mix in the egg and vanilla extract until fully combined. This step binds the mixture and infuses it with a warm, bakery-style flavor.

Step 3: Combine the Dry Ingredients

In a separate bowl, whisk together the flour, baking soda, and salt. Gradually add the dry ingredients to the wet mixture, mixing just until combined. Avoid overmixing to keep the cookies tender.

Step 4: Fold in the Marshmallows and Cereal

Gently fold in the mini marshmallows and Rice Krispies. Try not to over-stir — you want to keep the cereal intact to maintain its crunch in the baked cookie.

Step 5: Chill the Dough

Cover the dough and refrigerate for at least 30 minutes. Chilling helps the flavors meld and keeps the cookies from spreading too much during baking.

Step 6: Scoop and Space the Dough

Scoop cookie dough balls (about 2 tablespoons each) onto a baking sheet lined with parchment paper. Make sure to leave enough space between them, as they will spread slightly.

Step 7: Bake to Golden Perfection

Bake in a preheated oven at 350°F (175°C) for 10-12 minutes or until the edges are golden and the centers look slightly underbaked — they’ll finish setting as they cool.

Step 8: Cool and Enjoy

Let the cookies cool on the baking sheet for 5 minutes before transferring to a wire rack. Enjoy warm for the ultimate gooey marshmallow experience or store once fully cooled.

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How Long to Prepare the Costco Marshmallow Crispy Cookies Recipe

Making these cookies is a breeze, and they don’t require any special equipment or complicated steps. From start to finish, you’re looking at about 45–60 minutes — and that includes chill time for the dough, which is key to getting the right texture.

Prep Time: Mixing the dough and folding in all the ingredients takes about 15 minutes. If you’re a multitasker, you can clean up the kitchen while the dough chills.

Chill and Bake Time: Chill the dough for at least 30 minutes, then bake the cookies for 10–12 minutes. Let them cool slightly before digging in for the perfect gooey center.

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Tips for Perfect Costco Marshmallow Crispy Cookies

• Always chill the dough — this prevents over-spreading and enhances flavor.
• Use mini marshmallows; they melt evenly and distribute better in the dough.
• Don’t overbake! Take them out when the centers still look slightly underdone.
• Let the cookies rest on the baking sheet after baking — they’ll continue to firm up without drying out.
• Use parchment paper or silicone baking mats to keep the marshmallow from sticking.

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Watch Out for These Mistakes While Cooking

• Using stale cereal: Make sure your Rice Krispies are fresh for the best crunch.
• Skipping the chill time: Your cookies will spread too thin and lose their chewy center.
• Adding marshmallows too early: If your dough is too warm, they may melt before baking.
• Overmixing the dough: This can make the cookies tough instead of tender.
• Baking too long: The marshmallow can over-caramelize or burn if left in too long.

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What to Serve With Costco Marshmallow Crispy Cookies?

1. Cold Glass of Milk

Nothing beats the classic cookie-and-milk combo. These cookies are rich, and a cold glass of milk balances it perfectly.

2. Vanilla Ice Cream

Make ice cream cookie sandwiches or just serve on the side — hot cookie meets cold creaminess.

3. Hot Chocolate

Perfect for cozy evenings, and the marshmallow theme carries through deliciously.

4. Fresh Berries

Add some freshness and tartness to balance the sweetness of the cookie.

5. Coffee or Espresso

For adults, pair with a bold coffee or espresso to cut through the sugar.

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Storage Instructions

Room Temperature: Store the cookies in an airtight container for up to 4 days. Layer them with parchment paper to prevent sticking.

Refrigerator: You can store the dough for up to 3 days in the fridge. Let it come to room temperature before baking.

Freezer: Both baked cookies and unbaked dough balls freeze well. For baked cookies, freeze in a zip-top bag for up to 2 months. For dough, pre-scoop into balls and freeze on a tray before transferring to a bag. Bake from frozen, adding 1–2 extra minutes.

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Estimated Nutrition

Per Cookie (based on standard 2-tbsp dough size):

• Calories: ~220
• Fat: 9g
• Saturated Fat: 5g
• Carbohydrates: 31g
• Sugar: 17g
• Protein: 2g
• Fiber: 0g
• Sodium: 120mg

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Frequently Asked Questions

How do I keep marshmallows from leaking out?

Chill the dough and make sure marshmallows are tucked inside the dough ball, not exposed on the surface.

Can I use jumbo marshmallows instead?

You can, but cut them into smaller pieces. Mini marshmallows work better for even distribution.

Can I make this recipe gluten-free?

Yes! Use a 1:1 gluten-free all-purpose flour blend and make sure your cereal is gluten-free.

How do I know when they’re done baking?

Look for golden edges and soft centers that look slightly underdone — they’ll firm up as they cool.

Can I double the recipe?

Absolutely. Just make sure you chill the dough in batches and don’t overcrowd your baking sheet.

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Conclusion

These Costco Marshmallow Crispy Cookies are everything you love about homemade cookies with a fun, nostalgic twist. Gooey, chewy, crunchy, and perfectly sweet, they’re bound to become a favorite in your baking rotation. Whether you’re making them for a gathering, a bake sale, or just to satisfy a cookie craving, this recipe delivers every single time. Don’t be surprised if they disappear faster than you expect — they’re just that good.

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