Costco Marshmallow Crispy Cookies

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Soft, gooey, and delightfully crunchy—Costco Marshmallow Crispy Cookies are what dessert dreams are made of. These thick and chewy cookies combine the best of both worlds: a nostalgic Rice Krispies treat crunch on the outside, and a rich, soft-baked cookie interior with gooey marshmallow pockets throughout. They’re everything you love about classic childhood snacks, wrapped in a buttery cookie hug.

Inspired by the ever-popular Costco bakery item, this homemade version is even better because you control the chew, the goo, and the golden edges. Whether you’re baking for a party or just to treat yourself, these cookies deliver comfort and joy in every bite. They’re a hit with kids, adults, and anyone who loves cookies with a twist.

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Preparation Phase & Tools to Use

To make the perfect batch of Costco Marshmallow Crispy Cookies, you’ll need a few reliable kitchen tools that ensure the right texture and bake.

• Stand Mixer or Hand Mixer: Essential for creaming the butter and sugars together to achieve a fluffy dough base. This sets the stage for the right cookie structure.
• Large Mixing Bowls: You’ll need these to combine the dry and wet ingredients separately before merging them. Keeping things organized avoids over-mixing.
• Cookie Scoop: To ensure even-sized cookies that bake uniformly and have that irresistible bakery-style look.
• Baking Sheet + Parchment Paper: These help the cookies bake evenly without sticking, and promote a golden-bottom finish.
• Cooling Rack: Crucial for letting the cookies cool and firm up without continuing to bake on the hot pan.

Taking the time to prep your tools in advance will make the process smoother and more enjoyable. Plus, having the right tools makes all the difference between good cookies and bakery-worthy greatness.

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Ingredients for the Costco Marshmallow Crispy Cookies

Every ingredient in these cookies plays a key role in bringing texture, flavor, and structure to life:

• Unsalted Butter: Provides richness and that melt-in-your-mouth texture. Using unsalted lets you control the overall saltiness.
• Brown Sugar: Adds moisture and a deep caramel note to balance the sweetness.
• Granulated Sugar: Gives the cookies crisp edges and helps achieve the perfect chewy texture.
• Egg: Binds the dough and gives the cookies structure while keeping them soft.
• Vanilla Extract: Enhances the overall flavor, adding warmth and aroma.
• All-Purpose Flour: The base structure for the dough, holding everything together.
• Baking Soda: Allows the cookies to rise just enough, while staying soft and thick.
• Salt: Balances the sweetness and deepens flavor complexity.
• Mini Marshmallows: The gooey heart of each bite, melting just slightly to create those signature pockets.
• Crispy Rice Cereal: Adds that fun crunch and nostalgia—a nod to classic Rice Krispies treats.
• White Chocolate Chips (optional): Add an extra layer of creamy sweetness.

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How To Make the Costco Marshmallow Crispy Cookies

Step 1: Cream Butter and Sugars

In a large mixing bowl, beat the unsalted butter with both sugars until light and fluffy. This step creates a creamy base and introduces air into the dough.

Step 2: Mix in Wet Ingredients

Add in the egg and vanilla extract. Beat until well combined to ensure a smooth and cohesive dough.

Step 3: Add Dry Ingredients

In a separate bowl, whisk together the flour, baking soda, and salt. Slowly incorporate this into the wet mixture, mixing just until combined to avoid overworking the dough.

Step 4: Fold in Add-Ins

Gently fold in the mini marshmallows, crispy rice cereal, and optional white chocolate chips. Stir until evenly distributed, being careful not to crush the cereal.

Step 5: Scoop and Chill

Scoop dough into balls using a cookie scoop and place them on a parchment-lined baking sheet. Chill for 30 minutes to prevent spreading during baking.

Step 6: Bake to Perfection

Preheat oven to 350°F (175°C). Bake the cookies for 10–12 minutes, or until edges are golden but centers look slightly underbaked. Let cool on the sheet for 5 minutes, then transfer to a cooling rack.

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How to Serve and Store These Cookies

Costco Marshmallow Crispy Cookies are best served warm when the marshmallows are gooey and the crispy cereal still crackles. Serve them with a glass of milk, hot chocolate, or a coffee for the ultimate comfort treat. They also make adorable party favors or bake-sale stars when packed in clear cellophane bags.

For storing, keep the cookies in an airtight container at room temperature for up to 4 days. To keep them extra chewy, add a slice of bread to the container (it prevents them from drying out). You can also freeze unbaked cookie dough balls for up to 2 months—just bake from frozen, adding 1–2 extra minutes to the bake time.

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Frequently Asked Questions

How do I keep the marshmallows from melting too much?

Chilling the dough before baking helps marshmallows stay more intact. Also, try placing some marshmallows inside the dough ball rather than on the edges.

Can I use regular-sized marshmallows?

Mini marshmallows are best for even distribution, but you can chop larger ones into smaller bits if that’s what you have.

Why do I need to chill the dough?

Chilling prevents the cookies from spreading too much and gives them that thick, bakery-style appearance.

Can I make this recipe gluten-free?

Yes! Just use a good 1:1 gluten-free flour and double-check your crispy rice cereal is certified gluten-free.

What if I don’t have white chocolate chips?

You can skip them or substitute with semi-sweet chocolate, toffee bits, or even peanut butter chips for a different flavor twist.

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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:

• Whipped Shortbread Cookies for a melt-in-your-mouth buttery classic.
• Brownie Mix Cookies when you crave something rich and fudgy.
• Lemon Churro Cookies for a tangy-sweet treat with a cinnamon sugar crunch.
• Strawberry Cheesecake Dump Cake if you’re leaning into fruity and creamy combinations.

For even more irresistible cookie recipes and dessert inspiration, follow me on Pinterest @scherer29.

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Save This Recipe for Later

📌 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 you add the white chocolate or keep it classic? Did you serve them warm or freeze the extras?

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

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