Brown Butter Rice Cereal Marshmallow Cookies

Name: Brown Butter Rice Cereal Marshmallow Cookies
Prep time: 1 h 20 min
Cook time: 15 min
Total time: 1 h 35 min
Cuisine: American
Ingredients: 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

These Brown Butter Rice Cereal Marshmallow Cookies are a cozy mix of nutty browned butter, crisp rice cereal, and soft mini marshmallows. The browned butter gives a deep, toasty aroma and a caramellike richness that pairs beautifully with the light crunch of crispy rice cereal and the pillowy sweetness of the marshmallows. Each bite has crisp edges, a tender interior, and little toasted pops of cereal for texture. They are perfect for holiday cookie boxes, an afternoon treat with milk, or a fun dessert when you want something playful but grown up in flavor. If you enjoy a classic butter cookie base with an extra layer of flavor, you might like the approach used in basic butter cookies, which shares a similar attention to butter quality and technique.

Ingredients

1 cup unsalted butter, cut into 16 pieces
Use high quality butter for the best flavor, and cutting it into pieces helps it brown evenly.
2 and 1/4 cups all-purpose flour
Provides structure; spoon and level for accurate measurement.
2 teaspoons cornstarch
Adds tenderness and a slightly cakey crumb.
1 teaspoon baking soda
Gives a gentle lift and helps the cookies spread properly.
1/2 teaspoon salt
Balances sweetness and enhances the browned butter flavor.
2 cups crispy rice cereal
Adds crunch and familiar cereal texture; fold in gently to keep pieces intact.
1 cup mini marshmallows
Small marshmallows melt and create soft pockets of chew in the baked cookie.
3/4 cup packed light or dark brown sugar
Contributes moisture and a toffee note; dark brown will be deeper in flavor.
1/2 cup granulated sugar
Helps with spread and creates a slightly crisp edge.
1 large egg, at room temperature
Room temperature egg incorporates more smoothly for an even dough.
1 large egg yolk, at room temperature
Extra yolk adds richness and chew.
2 teaspoons pure vanilla extract
Rounds out the flavors and complements the brown butter.
Optional: flaky sea salt, for topping
Sprinkle after baking for a bright, salty contrast to the sweet marshmallows.

For another brown butter approach in cookies, see this brown sugar technique in basic butter cookies for inspiration on using browned fat in dough.

Step-by-Step Instructions

Brown the butter
In a light-colored skillet over medium heat, melt the butter while stirring constantly. After about 5 to 8 minutes, it will turn brown and smell nutty. Set aside to cool slightly. Tip: Use a light pan so you can see the color change easily and transfer to a heatproof bowl to stop cooking.
Whisk dry ingredients
In a bowl, whisk together flour, cornstarch, baking soda, and salt until combined.
Fold in cereal and marshmallows
Add crispy rice cereal and mini marshmallows to the dry mixture and fold gently so the cereal and marshmallows are evenly distributed but not crushed.
Combine wet ingredients
In another bowl, whisk brown butter, brown sugar, granulated sugar, egg, egg yolk, and vanilla until smooth. Make sure the brown butter is warm but not hot so it does not cook the eggs.
Make the dough
Pour wet mixture into the dry ingredients and stir until a sticky dough forms. The dough will be thick and studded with cereal and marshmallows.
Form cookies
Scoop 2 tablespoons of dough, roll into balls, and freeze for 1 hour. Freezing helps the cookies hold their shape and develop a tender interior.
Preheat oven
Preheat oven to 350°F and line baking sheets with parchment.
Bake
Arrange frozen dough balls on baking sheets, and bake for 14 to 15 minutes until edges are lightly browned. Do not overbake; the centers will set as they cool.
Finish and cool
If using, sprinkle flaky sea salt on top after baking. Cool on baking sheet for 10 minutes before transferring to a cooling rack.

A note on texture: for more pronounced crunch, fold in cereal just before baking and avoid overmixing in step 5.

For a slightly different nutty brown butter method, you can compare techniques used in brown sugar pop tart cookies which highlights timing and browning control.

Recipe Details

Prep Time: 1 hour 20 minutes (includes 1 hour freeze time)
Cook Time: 14 to 15 minutes per batch
Total Time: about 1 hour 34 minutes
Servings: about 18 cookies
Calories: approximately 225 calories per cookie

For a reminder on adjusting butter temperature and handling, this basic method is helpful: basic butter cookies.

Tips, Storage & Variations

Tips
- Use a light pan to brown butter so you can watch the color change.
- Freeze the dough balls so cookies bake up taller and chewier.
- If marshmallows stick to your scoop, lightly oil it or chill the scoop briefly between batches.
Storage and Freezing
- Store cooled cookies in an airtight container at room temperature for up to 3 days.
- Freeze baked cookies up to 1 month in a sealed container with parchment between layers.
- To freeze dough, keep frozen scooped dough balls in a single layer on a baking sheet, then transfer to a freezer bag for up to 3 months. Bake from frozen, adding 1 to 2 minutes to the bake time.
Flavor Variations using existing ingredients only
- Darker brown sugar for deeper molasses flavor by using the provided brown sugar option.
- Extra crisp: add an extra 1/4 cup crispy rice cereal to the dough for more crunch.
- Salty contrast: finish with flaky sea salt for a salt and sweet profile.

For another brown sugar technique and timing idea, see this related recipe note in brown sugar pop tart cookies.

Frequently Asked Questions

How do I know when the butter is properly browned?
It should have amber brown specks, a nutty aroma, and clear brown foam. Watch closely to avoid burning.
Can I skip freezing the dough?
Yes, but freezing helps cookies stay thicker and develop a chewier center.
Will the marshmallows melt completely?
Mini marshmallows will soften and create pockets of chew, but will not disappear entirely in most cases.
Can I use salted butter instead of unsalted?
Yes, but reduce or omit the added 1/2 teaspoon salt to avoid an overly salty cookie.
How should I reheat leftover cookies?
Warm briefly in a 300°F oven for 3 to 5 minutes to refresh texture.

Conclusion

I hope you enjoy these Brown Butter Rice Cereal Marshmallow Cookies for their toasty aroma, crunchy cereal bits, and soft marshmallow pockets. If you like marshmallow-forward treats, you might compare textures with a similar riff in Marshmallow Crispy Cookies (Costco Copycat) – The Salted Sweets. For another brown butter rice crisp take that explores extra gooey texture, see Brown Butter Rice Crispy Treats (Extra Gooey & Chewy!). Share how your batch turned out and any small twists you tried for a cozy, sweet finish.