Brown Butter Rice Cereal Marshmallow Cookies

These Brown Butter Rice Cereal Marshmallow Cookies are a nostalgic, grown-up take on a classic childhood treat. Nutty, deeply caramelized brown butter meets crunchy rice cereal and pockets of pillowy mini marshmallows for a cookie that is crisp at the edges, tender in the center, and just a little chewy from the marshmallows. The aroma while baking is warm and toasty, with a toasted sugar sweetness and toffee notes that make the kitchen smell irresistible. These cookies are perfect for casual get-togethers, school bake sales, or a comforting weeknight dessert when you want something quick but impressive. If you enjoy the brown butter flavor, you might also like my browned butter blondies which highlight the same nutty, caramel tone in a bar form.

Ingredients

1 cup unsalted butter, cut into 16 pieces
Use unsalted so you can control salt. Cutting into pieces helps it brown evenly.
2 and 1/4 cups all-purpose flour
Provides structure while keeping the cookies tender.
2 teaspoons cornstarch
Adds extra tenderness and a soft, melt-in-your-mouth crumb.
1 teaspoon baking soda
Gives the cookies lift and a light texture.
1/2 teaspoon salt
Balances sweetness. Use a little less if your butter is salted.
2 cups crispy rice cereal
Adds crunch and a classic rice crispy element to the cookie. For a similar crisp base, see this basic butter cookies reference.
1 cup mini marshmallows
Small marshmallows melt into soft, gooey pockets while baking.
3/4 cup packed light or dark brown sugar
Brown sugar brings moisture and a caramel, molasses note. Dark brown sugar will yield a deeper flavor.
1/2 cup granulated sugar
Helps with spread and crisp edges.
1 large egg, at room temperature
Adds structure and moisture.
1 large egg yolk, at room temperature
Gives extra richness and chew.
2 teaspoons pure vanilla extract
Rounds out the sweetness with warm aromatics.
Optional: flaky sea salt, for topping
A light sprinkle after baking brightens the flavors.

Step-by-Step Instructions

Brown the butter. In a skillet over medium heat, melt the butter, stirring constantly until it turns brown and smells nutty. Watch closely as it can go from brown to burnt quickly. Set aside to cool slightly.
Whisk dry ingredients. In a bowl, whisk together the all-purpose flour, cornstarch, baking soda, and salt until evenly combined.
Fold in cereal and marshmallows. Add the 2 cups crispy rice cereal and 1 cup mini marshmallows to the dry mixture, folding gently so the cereal and marshmallows are distributed without crushing them.
Combine wet ingredients. In another bowl, whisk the cooled brown butter, 3/4 cup packed brown sugar, 1/2 cup granulated sugar, 1 large egg, 1 large egg yolk, and 2 teaspoons vanilla until smooth and homogenous.
Make the dough. Pour the wet mixture into the dry ingredients and stir until combined into a sticky dough. The marshmallows will soften and incorporate slightly, which is expected.
Form the cookies. Scoop the dough into even balls using a cookie scoop or spoon. Place the balls on a tray and freeze for 1 hour. Freezing helps the cookies hold their shape and keeps the marshmallow from spreading.
Preheat oven. Preheat the oven to 350°F and line baking sheets with parchment paper. Position racks in the center of the oven for even browning.
Bake. Place the frozen dough balls on the prepared sheets and bake for 14 to 15 minutes, until they are lightly browned at the edges and set in the center.
Finish and cool. If using, sprinkle flaky sea salt on the cookies right when they come out of the oven. Cool the cookies on the sheet for 10 minutes before transferring to a wire rack to finish cooling. For a chocolate variation idea, check a similar concept in this chocolate marshmallow cookies recipe.

Recipe Details

Prep Time: 1 hour 20 minutes (including 1 hour freezing)
Cook Time: 14 to 15 minutes per batch
Total Time: About 1 hour 35 minutes
Servings: Makes about 24 cookies
Calories: Approximately 170 calories per cookie

For a rich, fudgy cookie idea in case you want to pair these with a brownie style, see this gourmet brownie cookies for inspiration.

Tips, Storage and Variations

Tip: When browning butter, keep it moving and watch for tiny brown bits forming on the bottom. Remove from heat as soon as you smell a nutty aroma to avoid burning.
Tip: Measure flour by spooning into the cup and leveling, do not pack, to avoid dense cookies.
Storage: Store cooled cookies in an airtight container at room temperature for up to 3 days. For longer storage, freeze baked cookies in a sealed container for up to 2 months. Thaw at room temperature.
Freezing dough: The frozen dough balls can be stored in a freezer bag for up to 3 months. Bake from frozen, adding an extra 1 to 2 minutes if needed.
Variation 1: Use dark brown sugar for a deeper molasses flavor while keeping quantities the same. For another brown sugar idea, see this brown sugar pop tart cookies which showcase the richness of brown sugar.
Variation 2: Add a few extra mini marshmallows on top of each dough ball before baking for more visible gooey pockets.
Variation 3: Sprinkle flaky sea salt after baking to contrast the sweetness and enhance the brown butter notes.

Frequently Asked Questions

Do I have to brown the butter?
No, but browning adds a nutty, caramel flavor that makes these cookies special. Regular melted butter will still work.
Why freeze the dough before baking?
Freezing firms the dough, helps the cookies hold shape, and prevents marshmallows from spreading too much.
Can I use regular rice cereal instead of crispy rice cereal?
Yes, use the cereal you have on hand. Crispy rice gives the lightest crunch.
Will the marshmallows melt away?
Mini marshmallows soften and become gooey pockets, but they should not completely disappear if mixed gently.
Can I use salted butter instead of unsalted?
Yes, but reduce or omit the added 1/2 teaspoon salt to avoid over-salting.
How do I get crisp edges and a soft center?
Bake until the edges are lightly browned and the center is set, then cool on the sheet for 10 minutes to finish cooking gently.

Conclusion

These Brown Butter Rice Cereal Marshmallow Cookies are an easy way to turn pantry staples into something nostalgic and elegant. The brown butter aroma and crispy marshmallow pockets make them a crowd pleaser for parties, gift boxes, or a cozy night in. If you want to explore a similar marshmallow crisp idea, this Marshmallow Crispy Cookies copycat is a fun comparison, and for a tray-bake inspiration that uses brown butter with rice cereal, try this Brown Butter Rice Crispy Treats. I hope you try the recipe and share how yours turned out, it makes the kitchen feel like a warm, happy place.

Brown Butter Rice Cereal Marshmallow Cookies

Print Recipe

These cookies combine nutty brown butter, crunchy rice cereal, and soft mini marshmallows for a delightful twist on a classic treat.

Author: hannah-reed
Prep Time: 80 minutes
Cook Time: 15 minutes
Total Time: 95 minutes
Yield: 24 cookies 1x
Category: Dessert
Method: Baking
Cuisine: American
Diet: Vegetarian

Ingredients

Scale

1 cup unsalted butter, cut into 16 pieces
2 and 1/4 cups all-purpose flour
2 teaspoons cornstarch
1 teaspoon baking soda
1/2 teaspoon salt
2 cups crispy rice cereal
1 cup mini marshmallows
3/4 cup packed light or dark brown sugar
1/2 cup granulated sugar
1 large egg, at room temperature
1 large egg yolk, at room temperature
2 teaspoons pure vanilla extract
Optional: flaky sea salt, for topping

Instructions

Brown the butter: In a skillet over medium heat, melt the butter, stirring constantly until it turns brown and smells nutty. Watch closely as it can go from brown to burnt quickly. Set aside to cool slightly.
Whisk dry ingredients: In a bowl, whisk together the all-purpose flour, cornstarch, baking soda, and salt until evenly combined.
Fold in cereal and marshmallows: Add the crispy rice cereal and mini marshmallows to the dry mixture, folding gently so the cereal and marshmallows are distributed without crushing them.
Combine wet ingredients: In another bowl, whisk the cooled brown butter, brown sugar, granulated sugar, egg, egg yolk, and vanilla until smooth and homogenous.
Make the dough: Pour the wet mixture into the dry ingredients and stir until combined into a sticky dough. The marshmallows will soften and incorporate slightly, which is expected.
Form the cookies: Scoop the dough into even balls using a cookie scoop or spoon. Place the balls on a tray and freeze for 1 hour.
Preheat oven: Preheat the oven to 350°F and line baking sheets with parchment paper.
Bake: Place the frozen dough balls on the prepared sheets and bake for 14 to 15 minutes, until they are lightly browned at the edges and set in the center.
Finish and cool: If using, sprinkle flaky sea salt on the cookies right when they come out of the oven. Cool the cookies on the sheet for 10 minutes before transferring to a wire rack to finish cooling.