Costco Marshmallow Crispy Cookies

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These Costco-inspired marshmallow crispy cookies combine the chewy satisfaction of a classic rice crispy treat with the indulgence of a soft cookie. Imagine biting into a golden, buttery cookie packed with gooey marshmallows and a gentle crunch that keeps you going back for more. They’re nostalgic yet new, like your childhood favorite reimagined into a dessert that’s perfect for any age.

Whether you’re making a quick treat for after-school snacks or planning a bake sale hit, these cookies deliver both ease and wow-factor. Plus, they freeze beautifully, making them an ideal make-ahead option. Let’s break down how to whip up your own batch of chewy-crunchy joy!

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What Kind of Marshmallows Work Best?

Mini marshmallows are ideal for this recipe. They melt quickly and evenly while still leaving gooey pockets throughout the cookie. If all you have are large marshmallows, chop them into small bits to avoid overwhelming the dough.

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Ingredients for the Costco Marshmallow Crispy Cookies

• 1 cup unsalted butter, softened
• 1 cup brown sugar, packed
• 1/2 cup granulated sugar
• 2 large eggs
• 2 teaspoons vanilla extract
• 2 1/2 cups all-purpose flour
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 2 cups crispy rice cereal
• 1 1/2 cups mini marshmallows
• 1 cup white chocolate chips (optional)

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How To Make the Costco Marshmallow Crispy Cookies

Step 1: Cream the Butter and Sugars

In a large mixing bowl, cream together the softened butter, brown sugar, and granulated sugar until light and fluffy. This step builds a tender cookie base.

Step 2: Add Eggs and Vanilla

Mix in the eggs one at a time, followed by the vanilla extract. Be sure everything is well incorporated.

Step 3: Mix the Dry Ingredients

In a separate bowl, whisk together the flour, baking soda, and salt. Gradually add this mixture to the wet ingredients, stirring until just combined.

Step 4: Fold in the Good Stuff

Gently fold in the crispy rice cereal, mini marshmallows, and white chocolate chips if using. Take care not to overmix, so the cereal stays crisp.

Step 5: Shape and Chill

Scoop the dough into heaping tablespoons and place them on a baking sheet lined with parchment paper. Chill the dough balls in the fridge for 20-30 minutes.

Step 6: Bake to Perfection

Bake in a preheated 350°F (175°C) oven for 10-12 minutes, until the edges are golden but the centers still look slightly soft. Let them cool on the baking sheet for 5 minutes before transferring to a wire rack.

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How to Serve and Store Marshmallow Crispy Cookies

Serve these cookies slightly warm for the ultimate gooey experience. They pair wonderfully with a glass of cold milk or a cozy mug of hot cocoa.

To store, place cooled cookies in an airtight container at room temperature for up to 5 days. For longer storage, freeze them in a single layer before transferring to a freezer bag—they’ll keep for up to 3 months.

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Frequently Asked Questions

How do I keep the marshmallows from melting too much?

Chilling the dough before baking helps prevent marshmallows from dissolving entirely. You can also press a few extra mini marshmallows into the tops of the dough balls before baking.

Can I use marshmallow fluff instead?

Marshmallow fluff will make the dough too sticky and unpredictable during baking. Stick with mini marshmallows for the best results.

Do I need to toast the cereal first?

Toasting isn’t necessary, but you can if you prefer an extra nutty flavor. Just don’t let it brown too much or it may go bitter.

Can I make these gluten-free?

Yes! Use a gluten-free all-purpose flour blend and certified gluten-free rice cereal.

Why are my cookies spreading too much?

This could be due to overly soft butter or skipping the chilling step. Make sure your dough is cold when it hits the oven.

Can I add chocolate chips?

Absolutely! White, milk, or dark chocolate chips all work beautifully in this dough.

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Want More Cookie Ideas with a Twist?

If you loved these marshmallow crispy cookies, you’ll probably enjoy these chewy, quirky favorites too:

• Irresistible Pecan Pie Bites for a nutty, caramel touch.
• Cherry Chocolate Cheesecake if you’re a fan of creamy, fruity decadence.
• Nutella French Toast Casserole when you’re craving brunch-style sweetness.
• Lemon Churro Cookies for citrusy zing and cinnamon warmth.
• Peanut Butter Balls with Chocolate Rice Krispies for a no-bake, crunchy treat.

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Save This Pin + Share Your Results

📌 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 skip the white chocolate or go all in? Maybe you added sprinkles?

I love hearing your twists and ideas. Feel free to ask questions too—let’s make baking more fun, one batch at a time.

Find more of my everyday sweet creations over on Pinterest at Nina Dishes.

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