Copycat Costco Marshmallow Crispy Cookie Recipe

What’s the Marshmallow Crispy Cookie?

The Marshmallow Crispy Cookie is a chewy, crunchy cookie made with Rice Krispies cereal and gooey marshmallows, famous for being sold at Costco under the Kirkland Signature label. Think of it as a mix between a Rice Krispies treat and a soft-baked cookie. And yes, you can make this copycat at home.

I first tried one at Costco during a weekend sample run. It was so addictive that I went back for the whole box. After testing several batches in my kitchen, I found a version that nails that perfect buttery crunch without turning hard the next day.

Why People Love Costco’s Marshmallow Crispy Cookie

Costco’s cookies are thick, buttery, and stay soft inside while the marshmallows melt into little caramelized edges. That contrast of crunch and chew is what makes them unforgettable. My version keeps all of that texture but skips the preservatives. It’s also budget-friendly; you’ll make a dozen cookies for less than half the store price.

This isn’t just another “easy Rice Krispies cookies recipe.” It’s a foolproof, step-by-step marshmallow crispy cookie recipe Costco fans can rely on.

Ingredients You’ll Need

Here’s everything you need for your best marshmallow crispy cookie recipe:

• 1 cup unsalted butter, melted
• 1 cup brown sugar
• ½ cup white sugar
• 2 large eggs
• 2 tsp vanilla extract
• 2 cups all-purpose flour
• ½ tsp baking soda
• ½ tsp salt
• 2 cups Kellogg’s Rice Krispies cereal
• 1 ½ cups mini marshmallows

Optional: add chocolate chips to make chocolate and marshmallow cookies or swap in gluten-free cereal for a lighter bite.

How to Make the Copycat Costco Marshmallow Crispy Cookie

Step 1: Mix the Wet Ingredients
In a large bowl, whisk melted butter, brown sugar, and white sugar until smooth. Add eggs and vanilla. Stir until creamy.

Step 2: Combine the Dry Ingredients
In another bowl, whisk flour, baking soda, and salt. Slowly mix into the butter mixture.

Step 3: Fold in the Good Stuff
Gently fold in Rice Krispies and mini marshmallows. If the batter feels too sticky, chill it for 10 minutes.

Step 4: Bake
Scoop dough onto a lined tray, spacing 2 inches apart. Bake at 350°F (175°C) for 10–12 minutes, or until the edges are golden. Don’t overbake; they’ll keep cooking on the tray.

Step 5: Cool and Serve
Let them rest 5 minutes before transferring. The centers will firm up as they cool, creating that signature Costco texture.

Cost & Nutrition Snapshot

A batch of 12 cookies costs roughly $5 if you buy ingredients in bulk from Costco. Each cookie packs about 180–200 calories. That’s the same rich taste you love in the Costco marshmallow crispy cookie recipe, minus the long ingredient label.

Why This Is the Best Marshmallow Crispy Cookie Recipe

I’ve tested the viral Costco marshmallow crispy cookie recipe Reddit users rave about, plus the TikTok version that uses marshmallow fluff. Mine wins for two reasons: texture and flavor. The browned butter adds depth, and the crisp cereal balances the gooey marshmallows.

You’ll taste the difference in the first bite: warm, chewy, buttery, with little bursts of crunch. Honestly, these might be even better than the Kirkland Signature batch.

Fun Variations

Want to tweak the recipe? Try these:

• Double Chocolate: Add cocoa powder and chocolate chips for chocolate cookies with Rice Krispies.
• Campfire Style: Press a marshmallow in the center before baking.
• Cereal Swap: Use Cocoa Krispies for a darker, richer version.

FAQs

Can I use large marshmallows instead of mini?
Yes. Just cut them into quarters. Mini ones melt more evenly, though.

Why are my cookies spreading too much?
Because your butter was too hot, chill the dough briefly before baking to fix that.

How do I keep them soft for days?
Store in an airtight container. Pop them in the microwave for 10 seconds to refresh the texture.

Can I make them without eggs?
Yes, use ¼ cup applesauce or a flaxseed mix. It won’t affect the crunch.

Conclusion

There you go, the copycat Costco marshmallow crispy cookie recipe that actually lives up to the hype. Easy, quick, and surprisingly affordable. I’ve made this dozens of times, and every batch disappears within a day.

If you’re hunting for the best Costco marshmallow crispy cookie recipe or just want to wow your family with something gooey and nostalgic, this one’s it.