Costco Marshmallow Crispy Cookies are a nostalgic twist on a classic treat that many of us grew up loving. These delightful cookies combine the chewy goodness of mini marshmallows with the crispiness of Rice Krispies, all nestled in a soft, buttery cookie base. Whether you’re looking for a quick dessert, an easy snack to share with friends, or a special addition to your holiday cookie platter, this recipe is sure to please. The combination of flavors and textures in these cookies is nothing short of magical, making them a popular choice for all ages.

Why You’ll Love This Costco Marshmallow Crispy Cookies
There are so many reasons to adore these cookies. First, they offer a unique combination of chewy and crunchy textures that tantalize your taste buds. Second, they’re incredibly simple to make, making them a perfect choice for beginner bakers. Third, these cookies are versatile; you can customize them with various mix-ins or toppings to suit your preferences. Fourth, they are ideal for sharing at parties or gatherings, as they are crowd-pleasers. Fifth, they can be made ahead of time, making them perfect for meal prep. Finally, they are a comforting treat that evokes fond memories of childhood, making them a sweet addition to any dessert spread. If you’re wondering how to make Costco-style marshmallow cookies, this recipe is your answer!

Ingredients for Costco Marshmallow Crispy Cookies
Gather these items:
- 1 cup unsalted butter, room temperature
- 1 cup brown sugar
- 1/2 cup granulated sugar
- 2 large eggs
- 2 teaspoons vanilla extract
- 2 1/4 cups all-purpose flour
- 1 teaspoon baking soda
- 1/2 teaspoon salt
- 1 1/2 cups mini marshmallows
- 2 cups Rice Krispies cereal
How to Make Costco Marshmallow Crispy Cookies Step-by-Step
- Step 1: Cream together the butter, brown sugar, and granulated sugar until light and fluffy.
- Step 2: Add eggs one at a time, beating well after each. Stir in vanilla extract.
- Step 3: In a separate bowl, whisk together flour, baking soda, and salt.
- Step 4: Gradually add dry ingredients to the wet mixture, mixing until just combined.
- Step 5: Fold in mini marshmallows and Rice Krispies cereal gently with a spatula.
- Step 6: Chill the dough for 30 minutes to 1 hour (optional, but recommended).
- Step 7: Preheat oven to 350°F (175°C). Line baking sheet with parchment paper.
- Step 8: Scoop 2-tablespoon-sized dough balls and place a few inches apart on the sheet.
- Step 9: Bake for 10–12 minutes, until edges are golden and centers are set.
- Step 10: Cool on baking sheet for 5 minutes before transferring to a wire rack.
Pro Tips for the Best Costco Marshmallow Crispy Cookies
Keep these in mind:
- Perfect for holiday cookie platters.
- Great for weekend baking projects.
- For an extra flavor kick, add chocolate chips or nuts!
- Ensure your butter is at room temperature for the best texture.

Best Ways to Serve Costco Marshmallow Crispy Cookies
These cookies can be enjoyed in many ways. Serve them warm with a glass of cold milk for a comforting treat. They also make a great addition to any dessert table, especially during the holidays. For a fun twist, you can create ice cream sandwiches using these cookies. Just sandwich your favorite ice cream flavor between two cookies for a delightful dessert.
How to Store and Reheat Costco Marshmallow Crispy Cookies
To keep your cookies fresh, store them in an airtight container at room temperature. They will stay good for up to one week. If you want to enjoy them warm later, you can reheat them in the microwave for a few seconds. This will restore their gooey marshmallow texture.
Frequently Asked Questions About Costco Marshmallow Crispy Cookies
What’s the secret to perfect Costco Marshmallow Crispy Cookies?
The secret lies in the balance of ingredients and the technique used. Be sure not to overmix the dough after adding the flour, and chilling it helps maintain the desired texture. You can also experiment with different types of marshmallows or even add chocolate for a twist!
Can I make Costco Marshmallow Crispy Cookies ahead of time?
Absolutely! You can prepare the dough and refrigerate it for up to 24 hours before baking. Just scoop the dough onto the baking sheet when you’re ready to bake, and you’ll have fresh cookies in no time.
How do I avoid common mistakes with Costco Marshmallow Crispy Cookies?
To avoid common mistakes, make sure to measure your ingredients accurately. Overbaking can lead to dry cookies, so keep an eye on them while they bake. Lastly, allow the cookies to cool slightly on the baking sheet before moving them to a wire rack, which helps them set properly.
Variations of Costco Marshmallow Crispy Cookies You Can Try
If you’re feeling adventurous, consider these variations:
- Add mini chocolate chips for a sweet chocolatey twist.
- Incorporate peanut butter for a nutty flavor.
- Substitute Rice Krispies with other crispy cereals for a unique texture.
- Try using flavored marshmallows such as strawberry or chocolate for a fun take on the classic.
For more delicious dessert ideas, check out Halloween Chocolate Chip Cookies or Grandma Carter’s Peanut Butter Cookies. If you’re interested in more baking tips, visit Bake Chocolate Eclair Cake.
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Costco Marshmallow Crispy Cookies: 7 Reasons You’ll Love Them
- Total Time: 45 minutes
- Yield: 24 cookies 1x
- Diet: Vegetarian
Description
These Costco Marshmallow Crispy Cookies are a nostalgic twist on a classic treat.
Ingredients
- 1 cup unsalted butter, room temperature
- 1 cup brown sugar
- 1/2 cup granulated sugar
- 2 large eggs
- 2 teaspoons vanilla extract
- 2 1/4 cups all-purpose flour
- 1 teaspoon baking soda
- 1/2 teaspoon salt
- 1 1/2 cups mini marshmallows
- 2 cups Rice Krispies cereal
Instructions
- Cream together the butter, brown sugar, and granulated sugar until light and fluffy.
- Add eggs one at a time, beating well after each. Stir in vanilla extract.
- In a separate bowl, whisk together flour, baking soda, and salt.
- Gradually add dry ingredients to the wet mixture, mixing until just combined.
- Fold in mini marshmallows and Rice Krispies cereal gently with a spatula.
- Chill the dough for 30 minutes to 1 hour (optional, but recommended).
- Preheat oven to 350°F (175°C). Line baking sheet with parchment paper.
- Scoop 2-tablespoon-sized dough balls and place a few inches apart on the sheet.
- Bake for 10–12 minutes, until edges are golden and centers are set.
- Cool on baking sheet for 5 minutes before transferring to a wire rack.
Notes
- Perfect for holiday cookie platters.
- Great for weekend baking projects.
- Prep Time: 15 minutes
- Cook Time: 10-12 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 cookie
- Calories: 210
- Sugar: 10g
- Sodium: 120mg
- Fat: 9g
- Saturated Fat: 5g
- Unsaturated Fat: 3g
- Trans Fat: 0g
- Carbohydrates: 30g
- Fiber: 1g
- Protein: 2g
- Cholesterol: 30mg