Marshmallow Crispy Cookies (Costco Copycat) Recipe

Introduction

These Marshmallow Crispy Cookies are a delightful blend of chewy, buttery cookie dough mixed with crispy rice cereal and gooey mini marshmallows. Inspired by the popular Costco treat, they offer the perfect balance of textures and a subtle salty-sweet flavor that keeps you coming back for more.

Ingredients

• ½ cup salted butter
• ¾ cup brown sugar
• ½ cup granulated sugar
• 1 large egg (room temperature)
• 1 teaspoon vanilla (vanilla paste recommended if available)
• ½ teaspoon baking soda
• ¾ teaspoon salt
• 1 cup all-purpose flour
• 1½ cups rice krispie cereal
• ⅔ cup mini marshmallows
• Flaked salt for topping

Instructions

1. Step 1: Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
2. Step 2: Brown the butter by melting ½ cup salted butter in a medium saucepan over medium heat. Continue cooking past boiling until it turns golden brown with a nutty aroma. Stir constantly to prevent burning. Once browned, transfer to a bowl and chill in the fridge or freezer for about 10 minutes to cool.
3. Step 3: In a mixing bowl, combine the cooled browned butter with brown sugar and granulated sugar. Add the egg and vanilla, mixing on low speed until smooth, about 30 seconds.
4. Step 4: Gradually add the salt, baking soda, and flour to the mixture. Stir gently to combine without overmixing.
5. Step 5: Fold in the rice krispie cereal followed by the mini marshmallows, ensuring they are evenly distributed throughout the dough.
6. Step 6: Scoop the dough into large balls using a 3-tablespoon scoop. Place 4-5 cookies per baking sheet, allowing enough space as they will spread thin.
7. Step 7: Bake for 10-13 minutes, until the edges turn a light golden brown. Avoid overbaking to maintain a chewy center. Immediately sprinkle with flaked salt after removing from the oven.

Tips & Variations

• Using vanilla paste instead of extract will give a more intense vanilla flavor and little flecks throughout the cookies.
• For extra chewiness, slightly underbake the cookies and let them cool on the baking sheet.
• Substitute rice krispies with your favorite crispy cereal if desired, though texture may vary.
• Sprinkle a little more flaked salt on top just before serving to enhance the sweet and salty contrast.

Storage

Store these cookies in an airtight container at room temperature for up to 3 days to maintain their chewy texture. For longer storage, keep them in the fridge for up to a week, but cookies may firm up slightly. To refresh, warm briefly in the microwave for 10-15 seconds to soften the marshmallows again.

How to Serve

Serve this delicious recipe with your favorite sides.

FAQs

Can I use unsalted butter instead of salted?

Yes, you can use unsalted butter; just be sure to add a bit more salt to the dough to keep the flavor balanced.

Will the marshmallows melt completely during baking?

The mini marshmallows will soften and partially melt, creating gooey pockets, but they won’t disappear entirely. This adds a lovely chewy texture and sweetness to the cookies.

Marshmallow Crispy Cookies (Costco Copycat) Recipe

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★★★★★

4.7 from 145 reviews

These Marshmallow Crispy Cookies are a delightful Costco copycat recipe featuring browned butter, crispy rice cereal, and gooey mini marshmallows for a perfect balance of chewy and crunchy textures. Topped with a sprinkle of flaked salt, these cookies offer a sweet and salty flavor combination that’s irresistible.

• Author: Logan
• Prep Time: 15 minutes
• Cook Time: 12 minutes
• Total Time: 27 minutes
• Yield: 12–15 cookies 1x
• Category: Dessert
• Method: Baking
• Cuisine: American

Ingredients

Scale 1x2x3x

Wet Ingredients

• ½ cup salted butter
• 1 large egg (room temperature)
• 1 teaspoon vanilla extract or vanilla paste

Dry Ingredients

• ¾ cup brown sugar
• ½ cup granulated sugar
• 1 teaspoon baking soda
• ¾ teaspoon salt + flaked salt for topping
• 1 cup all-purpose flour

Add-ins

• 1½ cups Rice Krispie cereal
• ⅔ cup mini marshmallows

Instructions

1. Preheat Oven: Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper to prepare for baking the cookies.
2. Brown Butter: In a medium saucepan over medium heat, melt ½ cup salted butter. Continue cooking past boiling until the butter foams and then turns a golden brown with a nutty aroma, being careful not to burn it. Stir frequently during this process. Once browned, transfer the butter to a bowl and chill in the fridge or freezer for about 10 minutes until cooled.
3. Mix Butter and Sugars: In a medium mixing bowl, combine the cooled browned butter with ¾ cup brown sugar and ½ cup granulated sugar. Add 1 large room-temperature egg and 1 teaspoon vanilla. Mix on low speed about 30 seconds until smooth and well combined.
4. Add Dry Ingredients: Slowly add ¾ teaspoon salt, ½ teaspoon baking soda, and 1 cup all-purpose flour to the wet mixture. Mix gently to combine without overmixing to keep the cookies tender.
5. Fold in Cereal and Marshmallows: Gently fold in 1½ cups Rice Krispie cereal followed by ⅔ cup mini marshmallows ensuring they are evenly distributed throughout the dough.
6. Scoop Cookies: Using a 3 tablespoon cookie scoop, portion the dough into large balls and place 4-5 on each prepared baking sheet, leaving enough room as the cookies spread thin while baking.
7. Bake and Finish: Bake for 10-13 minutes until the edges are light golden brown. Be careful not to over bake to preserve the chewy center. Immediately sprinkle the tops with flaked salt once removed from the oven. Let cool slightly before serving.

Notes

• For best texture, use room temperature egg to help mix the dough evenly.
• Keep an eye on the browned butter to avoid burning; remove from heat as soon as nutty aroma develops.
• Don’t overbake—the cookies should be soft in the center when done.
• Flaked salt on top enhances the sweet flavors and adds a pleasant crunch.
• Store cookies in an airtight container at room temperature for up to 3 days.
• You can substitute salted butter with unsalted butter plus ¼ teaspoon extra salt if desired.

Keywords: Marshmallow Cookies, Browned Butter Cookies, Rice Krispie Cookies, Costco Copycat Cookies, Chewy Cookies, Crispy Marshmallow Cookies