These Marshmallow Crispy Cookies (Costco Copycat) are the ultimate treat for cookie lovers! With their crispy texture and chewy mini marshmallows, these cookies are perfect for any occasion—be it a family gathering, a casual snack, or a sweet addition to dessert trays. The unique brown butter flavor adds depth, making them even more irresistible. You won’t believe how easy they are to whip up; no chilling is required, and they taste even better than those from Costco!

Jump to:
- Why You’ll Love This Recipe
- Tools and Preparation
- Essential Tools and Equipment
- Importance of Each Tool
- Ingredients
- For the Dough
- For the Mix-Ins
- How to Make Marshmallow Crispy Cookies (Costco Copycat)
- Step 1: Preheat the Oven
- Step 2: Brown the Butter
- Step 3: Mix the Wet Ingredients
- Step 4: Add Dry Ingredients
- Step 5: Fold in Rice Krispies and Marshmallows
- Step 6: Scoop the Dough
- Step 7: Bake the Cookies
- How to Serve Marshmallow Crispy Cookies (Costco Copycat)
- Pair with Milk
- Ice Cream Sandwiches
- Gift Bags
- Coffee or Tea
- Dessert Platter
- How to Perfect Marshmallow Crispy Cookies (Costco Copycat)
- Best Side Dishes for Marshmallow Crispy Cookies (Costco Copycat)
- Common Mistakes to Avoid
- Refrigerator Storage
- Freezing Marshmallow Crispy Cookies (Costco Copycat)
- Reheating Marshmallow Crispy Cookies (Costco Copycat)
- Frequently Asked Questions
- What makes these Marshmallow Crispy Cookies different from regular cookies?
- Can I customize my Marshmallow Crispy Cookies (Costco Copycat)?
- How long do Marshmallow Crispy Cookies (Costco Copycat) last?
- Can I make these cookies gluten-free?
- Final Thoughts
- 📖 Recipe Card
Why You’ll Love This Recipe
- Quick and Easy: This recipe requires minimal prep time and no chilling, so you can enjoy fresh cookies in no time.
- Rich Flavor: The brown butter elevates the taste, giving these cookies a delightful caramel-like essence.
- Versatile Treat: Ideal for parties, lunches, or just because—you’ll find every reason to make these cookies!
- Chewy and Crispy Texture: The combination of rice krispies and marshmallows creates a fun texture that’s both chewy and crispy.
- Kid-Friendly Fun: Kids will love helping with the mixing and adding marshmallows—perfect for family baking days!
Tools and Preparation
To create your own batch of Marshmallow Crispy Cookies (Costco Copycat), gather essential tools to streamline your baking process.
Essential Tools and Equipment
- Mixing bowls
- Medium saucepan
- Baking sheet
- Parchment paper
- Cookie scoop
Importance of Each Tool
- Mixing bowls: Essential for combining ingredients without mess.
- Medium saucepan: Perfect for browning butter evenly and preventing burning.
- Baking sheet: Provides a sturdy base for even cooking of cookies.
Ingredients
These brown butter marshmallow crispy cookies are a crispy cookie loaded with rice krispies and chewy mini marshmallows with a caramel tasting brown butter dough. They are simple to make, no chilling required and taste better than Costco’s (yep! I said it)!
For the Dough
- ½ cup salted butter
- ¾ cup brown sugar
- ½ cup granulated sugar
- 1 large egg (room temperature)
- 1 teaspoon vanilla (this is a good time to use vanilla paste if you have it)
- ½ tsp baking soda
- ¾ tsp salt
- 1 cup all-purpose flour
For the Mix-Ins
- 1½ cups rice krispie cereal
- ⅔ cup mini marshmallows
- Flaked salt for topping
How to Make Marshmallow Crispy Cookies (Costco Copycat)
Step 1: Preheat the Oven
Preheat your oven to 350°F. Line a baking sheet with parchment paper to prevent sticking.
Step 2: Brown the Butter
- In a medium saucepan, melt ½ cup of salted butter over medium heat.
- Continue cooking until the butter turns golden brown with a nutty aroma. Stir constantly to avoid burning.
- Once browned, pour the butter into a bowl and cool in the fridge or freezer for about 10 minutes.
Step 3: Mix the Wet Ingredients
In a medium mixing bowl:
1. Combine the cooled brown butter with both sugars.
2. Add one large egg and vanilla extract.
3. Mix on low speed until smooth—about 30 seconds.
Step 4: Add Dry Ingredients
Slowly mix in:
1. ¾ tsp salt,
2. ½ tsp baking soda,
3. 1 cup all-purpose flour.
Take care not to overmix; just combine until everything is incorporated.
Step 5: Fold in Rice Krispies and Marshmallows
Gently fold in:
1. 1½ cups rice krispie cereal,
2. ⅔ cup mini marshmallows.
Make sure they’re evenly distributed throughout the dough.
Step 6: Scoop the Dough
Use a cookie scoop (about 3 tablespoons) to portion out dough onto your prepared baking sheet:
1. Place 4-5 cookie balls per sheet; they spread while baking.
Step 7: Bake the Cookies
Bake in your preheated oven for 10-13 minutes:
1. Look for light golden edges but soft centers.
2. Avoid overbaking; remove from oven when edges are set but center remains slightly underbaked.
3. Sprinkle flaked salt on top immediately after removing from the oven.
Enjoy your delightful batch of Marshmallow Crispy Cookies (Costco Copycat)!
How to Serve Marshmallow Crispy Cookies (Costco Copycat)
Marshmallow crispy cookies are a delightful treat that can be enjoyed in various ways. Whether you’re celebrating a special occasion or just indulging in a personal snack, these cookies can be served in many creative ways.
Pair with Milk
- A classic glass of cold milk complements the sweetness and chewy texture of the cookies.
Ice Cream Sandwiches
- Place a scoop of your favorite ice cream between two cookies for an indulgent dessert.
Gift Bags
- Package these cookies in decorative bags for a sweet homemade gift to friends and family.
Coffee or Tea
- Enjoy these cookies with a warm cup of coffee or tea for a cozy afternoon treat.
Dessert Platter
- Arrange marshmallow crispy cookies on a dessert platter alongside other treats for parties or gatherings.

How to Perfect Marshmallow Crispy Cookies (Costco Copycat)
To get the most out of your marshmallow crispy cookies, consider these helpful tips for perfecting your baking technique.
- Brown the Butter Carefully: Watch the butter closely while it browns. It should develop a nutty aroma and golden color without burning.
- Use Room Temperature Eggs: This helps the ingredients combine better, leading to a smoother cookie dough.
- Don’t Overmix: When adding flour and dry ingredients, mix just until combined to keep the cookies tender.
- Scoop Generously: Use a large cookie scoop to ensure uniformity in size, which helps with even baking.
- Cool Before Serving: Allow the cookies to cool on the baking sheet for a few minutes before transferring them to a wire rack. This will help maintain their chewy texture.
Best Side Dishes for Marshmallow Crispy Cookies (Costco Copycat)
While marshmallow crispy cookies shine as standalone treats, they also pair well with several side dishes that enhance your dessert experience. Here are some delicious ideas:
- Fruit Salad: A refreshing mix of seasonal fruits adds brightness and balances sweetness.
- Cheese Platter: Pair with mild cheeses like brie or cream cheese to contrast the sweetness of the cookies.
- Chocolate Fondue: Dip fresh fruits or pretzels into chocolate for an extra layer of indulgence.
- Trail Mix: A mix of nuts and dried fruits provides crunch and complements the soft texture of the cookies.
- Yogurt Parfait: Layer yogurt, granola, and pieces of cookie for a fun twist on breakfast.
- Hot Chocolate Bar: Set up a hot chocolate station where guests can customize their drinks with toppings like whipped cream and sprinkles.
Common Mistakes to Avoid
Making Marshmallow Crispy Cookies (Costco Copycat) can be fun, but there are some common mistakes that can impact the outcome. Here are a few to watch out for:
- Overbrowning the butter: When browning your butter, keep a close eye on it. If it turns too dark, the flavor will become bitter. Stir constantly and remove it from heat as soon as it reaches a nice golden color.
- Not using room temperature egg: Using cold eggs can affect the mixing process and final texture of the cookies. Always let your egg sit at room temperature before adding it to the mix.
- Overmixing the dough: Mixing too much after adding flour can lead to tough cookies. Mix just until combined for a tender texture.
- Skipping the cooling phase: Allowing browned butter to cool is crucial. If you add hot butter to the sugars, it can lead to greasy cookies.
- Not measuring ingredients accurately: Baking is a science, and improper measurements can ruin your cookies. Use measuring cups and spoons for precision.
- Baking at incorrect temperature: Make sure your oven is preheated correctly. An oven that’s too hot or too cold can change the baking time and texture of your cookies.
Refrigerator Storage
- Store cookies in an airtight container.
- They will stay fresh for up to 5 days in the fridge.
Freezing Marshmallow Crispy Cookies (Costco Copycat)
- Place cooled cookies in a freezer-safe container.
- They can be frozen for up to 3 months.
- Separate layers with parchment paper to prevent sticking.
Reheating Marshmallow Crispy Cookies (Costco Copycat)
- Oven: Preheat to 350°F and bake for about 5-7 minutes until warm.
- Microwave: Heat individually for about 10-15 seconds for a soft cookie.
- Stovetop: Use a skillet over low heat, covering with a lid for about 1 minute until warmed through.
Frequently Asked Questions
What makes these Marshmallow Crispy Cookies different from regular cookies?
These cookies feature brown butter, which adds a rich, nutty flavor that elevates them above regular cookies. The combination of crispy rice cereal and chewy mini marshmallows creates a delightful texture contrast.
Can I customize my Marshmallow Crispy Cookies (Costco Copycat)?
Absolutely! You can add chocolate chips, nuts, or even swirl in some peanut butter for extra flavor. Customize them according to your taste preferences!
How long do Marshmallow Crispy Cookies (Costco Copycat) last?
When stored properly in an airtight container, these cookies will stay fresh in the refrigerator for up to 5 days or can be frozen for up to 3 months.
Can I make these cookies gluten-free?
Yes! Substitute all-purpose flour with a gluten-free blend. Ensure that your rice krispies are also gluten-free to keep this recipe suitable for those with dietary restrictions.
Final Thoughts
Marshmallow Crispy Cookies (Costco Copycat) are not only easy to make but also incredibly delicious! Their chewy centers combined with crispy edges create an irresistible treat perfect for any occasion. Feel free to experiment with different mix-ins or toppings, making them your own every time you bake them!
Did You Enjoy Making This Recipe? Please rate this recipe with ⭐⭐⭐⭐⭐ or leave a comment.
📖 Recipe Card
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Marshmallow Crispy Cookies (Costco Copycat)
- Total Time: 27 minutes
- Yield: Approximately 24 cookies 1x
Description
Indulge in the delightful taste of Marshmallow Crispy Cookies (Costco Copycat), where crispy rice cereal meets chewy mini marshmallows in a rich, brown butter cookie dough. These cookies are the perfect treat for any occasion, offering a sweet balance of crispy edges and gooey centers. Quick to prepare without any chilling time, this recipe will have you enjoying homemade cookies that rival your favorite Costco version in just minutes. Whether you’re hosting a gathering or simply treating yourself, these cookies will certainly satisfy your sweet tooth!
Ingredients
- ½ cup salted butter
- ¾ cup brown sugar
- ½ cup granulated sugar
- 1 large egg
- 1 teaspoon vanilla extract
- ½ teaspoon baking soda
- ¾ teaspoon salt
- 1 cup all-purpose flour
- 1½ cups rice krispie cereal
- ⅔ cup mini marshmallows
Instructions
- Preheat your oven to 350°F and line a baking sheet with parchment paper.
- In a medium saucepan, melt the butter over medium heat until browned; let cool slightly.
- In a mixing bowl, combine the cooled brown butter with both sugars, egg, and vanilla; mix until smooth.
- Gradually add baking soda, salt, and flour; mix until just combined.
- Gently fold in rice krispie cereal and marshmallows.
- Scoop dough onto the prepared baking sheet (4-5 per sheet) and bake for 10-13 minutes until edges are golden but centers remain soft.
- Allow to cool slightly before serving.
- Prep Time: 15 minutes
- Cook Time: 12 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 cookie (25g)
- Calories: 120
- Sugar: 9g
- Sodium: 80mg
- Fat: 5g
- Saturated Fat: 3g
- Unsaturated Fat: 2g
- Trans Fat: 0g
- Carbohydrates: 17g
- Fiber: <1g
- Protein: 1g
- Cholesterol: 15mg





