As I stood in my kitchen, the warm aroma of nutty brown butter filled the air, instantly transporting me to my childhood. Today, I’ll share my version of Brown Butter Marshmallow Crispy Cookies, a delightful Costco copycat that’s perfect for anyone ready to escape the realm of fast food and dive into homemade joy. This simple, no-chill recipe is not only quick to whip up in just 36 minutes, but it also delivers that nostalgic rice krispie treat flavor with a fabulous crunchy twist. Imagine making delicious cookies that are ideal for busy days and indulgent enough to impress friends! Curious about how to elevate your cookie game? Let’s get into the sweet details!

Why Are These Cookies So Addictive?
Irresistible Flavor: The combination of nutty brown butter and sweet marshmallows creates a deep, enticing flavor that leaves everyone wanting more.
Quick and Easy: Whipping up these cookies takes just 36 minutes, making it perfect for a spontaneous treat when you need a break from the mundane.
Versatile Variations: Feel free to mix in chocolate chips or nuts to tailor these treats to your personal taste—endless options await!
Nostalgic Texture: With a delightful crispy exterior and a chewy center, each bite tastes like a childhood favorite, evoking warmth and fond memories.
Crowd-Pleaser: These cookies are sure to be a hit at any gathering, from casual get-togethers to more formal celebrations. Pair them with a glass of milk or your favorite coffee for the ultimate indulgent experience! Want more delightful ideas? Check out these Cappuccino Cookies Chewy or Snickerdoodle Cookies Sweet for more homemade treats!
Marshmallow Crispy Cookies Ingredients
• Get ready to whip up a nostalgic treat with these essential ingredients!
For the Cookies
- Salted Butter – Adds richness and flavor; you can substitute with unsalted butter and a pinch of salt for balance.
- Brown Sugar – Delivers sweetness and a subtle caramel flavor; there are no substitutions needed for that perfect taste.
- Granulated Sugar – Enhances the sweetness and contributes to a crispy texture; no substitutions necessary to achieve the right crisp.
- Large Egg (room temperature) – Binds the ingredients and adds moisture; ensure it’s at room temperature for better mixing.
- Vanilla Extract – Boosts the flavor; if desired, vanilla paste can elevate the flavor even further.
- Baking Soda – Acts as a leavening agent for just the right texture; no substitutions will ensure proper rise.
- Salt – Balances sweetness and enhances overall flavors; adjust according to your taste but it’s essential for a great flavor.
- All-Purpose Flour – Provides structure to the cookies; for a gluten-free version, simply use a 1:1 gluten-free flour blend.
- Rice Krispie Cereal – Adds delightful crunch; you can swap in a gluten-free rice cereal if needed.
- Mini Marshmallows – Offers chewiness and a hint of sweetness; omit or replace with chocolate chips for a fun variation.
- Flaked Salt – A topping that enhances flavor; optional, but highly recommended for that sophisticated touch.
These Marshmallow Crispy Cookies are brimming with nostalgia, ready to elevate your homemade treat game to new heights!
Step‑by‑Step Instructions for Marshmallow Crispy Cookies
Step 1: Preheat the Oven
Begin your cookie-making adventure by preheating your oven to 350°F (175°C). While the oven warms up, line a baking sheet with parchment paper to prevent sticking and ensure easy cleanup. This first step sets the stage for baking those delicious Marshmallow Crispy Cookies, so don’t skip it!
Step 2: Brown the Butter
In a medium saucepan, melt ½ cup of salted butter over medium heat, stirring constantly. Watch carefully as it transforms into a beautiful golden brown with a nutty aroma, which should take about 5-7 minutes. Once browned, remove it from heat and let the mixture cool in the refrigerator for about 10 minutes to reach the right texture.
Step 3: Mix the Sugars and Butter
In a mixing bowl, combine the cooled brown butter with ¾ cup of brown sugar and ¼ cup of granulated sugar. Use a hand mixer or a wooden spoon to blend the mixture until it’s smooth and creamy, which should take approximately 2-3 minutes. This step infuses your Marshmallow Crispy Cookies with richness and sweetness!
Step 4: Add Egg and Vanilla
Next, add one large room-temperature egg and 1 teaspoon of vanilla extract to the mixture. Blend until fully combined, ensuring that everything is well incorporated and that the texture is light and fluffy. This is where the lovely flavor and moisture begin to develop for your cookies.
Step 5: Incorporate Dry Ingredients
Gradually add 1 teaspoon of baking soda, ¼ teaspoon of salt, and 1 cup of all-purpose flour to the wet ingredients. Mix gently until just blended and there are no visible flour streaks. Be careful not to overmix, as you want your Marshmallow Crispy Cookies to have the perfect chewy texture!
Step 6: Fold in the Crunch
Now it’s time to fold in 3 cups of Rice Krispie cereal and 1 cup of mini marshmallows. Use a spatula to gently combine them, ensuring that the cereal and marshmallows are evenly distributed throughout the dough. This adds that delightful crunch and chew to each cookie, making them irresistible!
Step 7: Scoop the Dough
Using a 3-tablespoon cookie scoop, portion out the dough onto the prepared baking sheet. Space the cookies about 4-5 inches apart to allow for spreading. You should be able to fit about 6 cookie mounds per tray. This creates the perfect size for your Marshmallow Crispy Cookies to bake evenly.
Step 8: Bake
Place the baking sheet in the preheated oven and bake the cookies for 10-13 minutes, or until they are lightly golden around the edges. Keep an eye on them towards the end of the baking time to avoid overbaking. Your kitchen will soon be filled with the heavenly aroma of freshly baked cookies!
Step 9: Finish with Flaked Salt
Remove the baking sheet from the oven and let the cookies cool for a few minutes. Before they fully cool, sprinkle a touch of flaked salt on top of each cookie to enhance the flavor. Let them finish cooling on the baking sheet for an even tastier treat that highlights the deliciousness of your Marshmallow Crispy Cookies!

Marshmallow Crispy Cookies Variations
Feel free to let your creativity shine by customizing these delightful cookies, elevating their flavors and textures to match your unique taste!
- Chocolate Chip Twist: Substitute mini marshmallows with chocolate chips to create a rich, sweet flavor that chocolate lovers will adore.
- Nutty Delight: Toss in chopped nuts like pecans or walnuts for added crunch and a warm, earthy undertone. Each bite will surprise you with its delightful texture!
- Spiced Up: Add a dash of cinnamon or nutmeg to the dough for a warm, comforting spice, reminiscent of cozy evenings by the fireplace.
- Fruit Flavor: Fold in dried fruits like cranberries or apricots for a touch of sweetness and chewiness, balancing the crunch with a fruity burst of flavor.
- Dairy-Free Option: Replace the butter with coconut oil and use dairy-free chocolate chips for a deliciously decadent, lactose-free treat.
- Gluten-Free Alternative: Use a gluten-free 1:1 flour blend to cater to dietary preferences, ensuring everyone can indulge in these cookies!
- Salted Caramel Swirl: Drizzle some warm caramel sauce over the cookies before they cool for an indulgent, gooey experience everyone will love.
- Mini Marshmallow Pop: Use larger marshmallows cut in half for an eye-catching presentation, giving each cookie a fun, pillowy touch!
For expanded recipe inspiration, consider exploring delicious Blueberry Oatmeal Cookies or creating charming Thumbprint Cookies Cozy as another treat variation!
Make Ahead Options
These Marshmallow Crispy Cookies are ideal for meal prep, making your busy days a little sweeter! You can prepare the dough up to 24 hours in advance; simply mix all the ingredients until just blended, then cover the bowl with plastic wrap and refrigerate. This chilling helps deepen the flavors and maintain the dough’s quality. When you’re ready to bake, scoop the dough onto a baking sheet and allow it to sit at room temperature for about 10 minutes before baking. This way, you’ll enjoy delicious cookies with a chewy center and crispy edges at a moment’s notice, all without compromising on that nostalgic taste!
Expert Tips for Marshmallow Crispy Cookies
Perfectly Browned Butter: Stir continuously while browning the butter to avoid burning and achieve that nutty flavor that makes these cookies irresistible.
Room Temperature Egg: Ensure your egg is at room temperature for better emulsification, resulting in a more cohesive dough for your Marshmallow Crispy Cookies.
Avoid Overmixing: Mix the dry ingredients just until they are incorporated to maintain the fluffy, chewy texture of the cookies—overmixing can lead to dense results.
Chill the Dough: For thicker cookies, consider chilling the dough for 15-30 minutes before baking. This helps prevent spreading, perfect for achieving the ideal texture.
Use a Cookie Scoop: Utilizing a 3-tablespoon cookie scoop allows for uniform cookie sizes, ensuring even baking and a consistent texture across all your Marshmallow Crispy Cookies.
Store Properly: Keep cookies in an airtight container at room temperature for 2-3 days to maintain freshness or freeze for up to 3 months for longer storage.
How to Store and Freeze Marshmallow Crispy Cookies
Room Temperature: Keep these cookies in an airtight container at room temperature for up to 2-3 days. This will help maintain their fresh, chewy texture.
Freezer: For longer storage, freeze the cookies in a single layer, then transfer them to a freezer-safe bag or container for up to 3 months. They’ll be ready for a sweet treat anytime!
Reheating: When you’re ready to enjoy a frozen cookie, simply thaw at room temperature for about 15-20 minutes, or warm in the oven at 350°F for 5-7 minutes for that freshly baked taste.
Serving: These Marshmallow Crispy Cookies are best enjoyed fresh, but freezing allows you to savor that delightful crunch whenever a craving strikes!
What to Serve with Brown Butter Marshmallow Crispy Cookies
Indulge in the sweet bliss of a perfect meal with these delightful cookies as your centerpiece.
- Creamy Milk: A classic pairing that balances sweetness and adds a refreshing contrast to the rich cookie flavors.
- Rich Coffee: The boldness of coffee complements the nutty brown butter and sweet marshmallows, making each bite even more enjoyable.
- Ice Cream Sundae: Serve these cookies broken over a scoop of vanilla ice cream for a deliciously playful dessert experience. The combination of warm cookies and cold ice cream creates a delightful textural contrast.
- Fruit Salad: A refreshing mix of seasonal fruits adds a bright, tart element that cuts through the sweetness, balancing the dish beautifully.
- Chocolate Milkshake: A thick, chocolatey shake takes the nostalgic theme to another level, perfect for a fun dessert or weekend treat.
- Nutty Trail Mix: Pair with a handful of homemade or store-bought trail mix for a delightful mix of crunch and chew, enhancing the overall texture experience.
- Hot Chocolate: Cozy up with a cup of rich hot chocolate, perfect for dipping and savoring every chocolatey, gooey moment alongside your marshmallow crispy cookies.
- Cookies and Cream Ice Cream: For a truly indulgent delight, use these cookies as a topping for cookies and cream ice cream, combining the best of both worlds.
- Banana Bread Pudding: Elevate your dessert game by serving these cookies alongside warm banana bread pudding, as the two desserts intertwine for a comforting experience.

Marshmallow Crispy Cookies Recipe FAQs
How do I choose the right ripeness of the butter for this recipe?
Absolutely! For brown butter, you want to use unsalted or salted butter that is fresh and slightly soft, but not melted. When melted gently over medium heat, it will reach a beautiful golden brown with a rich, nutty aroma. If you see dark spots or burnt edges, start over to ensure the best flavor!
How should I store leftover cookies?
These cookies can be stored in an airtight container at room temperature for 2-3 days. If you want to keep them longer, place them in the fridge for up to a week or freeze them for up to 3 months. Just be sure to separate layers with parchment paper to prevent sticking!
Can I freeze Marshmallow Crispy Cookies?
Yes! To freeze these delicious cookies, first let them cool completely. Arrange them in a single layer on a baking sheet and freeze for about 1-2 hours until solid. Afterwards, transfer them to a freezer-safe bag or container. They will keep well for up to 3 months! To enjoy, just thaw at room temperature for 15-20 minutes or warm them in a preheated oven at 350°F for 5-7 minutes.
What if my cookies turn out too thin or spread too much?
If your cookies spread too much and become thin, it may be due to the brown butter being too warm when mixed with the sugars, or neglecting to chill the dough for a bit. To troubleshoot, you can add 1-2 extra tablespoons of flour for a thicker texture. Alternatively, chill the dough for 15-30 minutes before baking to prevent spreading.
Are these cookies safe for people with gluten allergies?
Yes! You can easily make gluten-free Marshmallow Crispy Cookies by substituting all-purpose flour with a gluten-free 1:1 flour blend. Just ensure all other ingredients, especially the rice cereal and other add-ins, are gluten-free as well. Enjoy without worry!
Can I give these cookies to my pet?
It’s best to avoid giving these cookies to pets. The ingredients like sugar and butter aren’t suitable for animals and could lead to digestive issues. Stick to pet-friendly treats for your furry friends!
Marshmallow Crispy Cookies Recipe FAQs

Marshmallow Crispy Cookies: A Nostalgic Treat Made Easy
Ingredients
Equipment
Method
- Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
- Melt ½ cup of salted butter over medium heat until browned, about 5-7 minutes, then cool.
- Combine cooled brown butter with ¾ cup of brown sugar and ¼ cup of granulated sugar until smooth.
- Mix in 1 large egg and 1 teaspoon of vanilla extract until fluffy.
- Gradually mix in 1 teaspoon of baking soda, ¼ teaspoon of salt, and 1 cup of flour until combined.
- Fold in 3 cups of Rice Krispie cereal and 1 cup of mini marshmallows.
- Scoop dough onto the prepared baking sheet, spacing cookies 4-5 inches apart.
- Bake for 10-13 minutes or until lightly golden around the edges.
- Sprinkle flaked salt on top while the cookies cool on the baking sheet.

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