If you love the nostalgic taste of Rice Krispie treats, these Brown Butter Marshmallow Crispy Cookies are about to become your new obsession. They combine crispy cereal, gooey marshmallows, and rich brown butter into one irresistible cookie that’s crunchy, chewy, and full of caramel-like flavor.
Even better? They’re quick to make, no chilling required, and taste even better than the famous Costco version!
✨ Why You’ll Love These Cookies
- Crispy + chewy texture in every bite
- Rich brown butter flavor that elevates the whole cookie
- Tastes like a Rice Krispie treat in cookie form
- No dough chilling needed = faster baking
- Easy, fun, and perfect for sharing
⏱️ Time & Yield
- Prep Time: 25 minutes
- Bake Time: 10–13 minutes
- Total Time: 35–40 minutes
- Yield: ~12–13 cookies
🛒 Ingredients
- ½ cup (113 g) salted butter
- ¾ cup (165 g) brown sugar
- ½ cup (100 g) granulated sugar
- 1 large egg (room temperature)
- 1 teaspoon vanilla extract
- ½ teaspoon baking soda
- ¾ teaspoon salt
- 1 cup + 2 tablespoons (158 g) all-purpose flour
- 1½ cups Rice Krispies cereal
- ⅔ cup mini marshmallows
- Flaky sea salt (for topping)
👩🍳 Instructions
1. Brown the Butter
In a saucepan, melt butter over medium heat and continue cooking until it turns golden brown with a nutty aroma.
Let it cool for about 10 minutes.
2. Mix Wet Ingredients
In a bowl, combine browned butter with both sugars.
Add egg and vanilla, mixing until smooth.
3. Add Dry Ingredients
Stir in baking soda, salt, and flour until just combined.
Avoid overmixing.
4. Fold in Mix-Ins
Gently fold in Rice Krispies, then mini marshmallows.
5. Shape the Cookies
Scoop large dough balls (about 3 tablespoons each) onto a lined baking sheet, leaving space between them.
6. Bake
Bake at 350°F (175°C) for 10–13 minutes until edges are lightly golden.
Sprinkle with flaky salt right after baking.
7. Cool & Enjoy
Let cookies cool slightly before serving. Enjoy the gooey marshmallow texture!
💡 Pro Tips
- Watch the butter closely—it can burn quickly
- Don’t overbake to keep the soft, chewy center
- If cookies spread unevenly, gently reshape while warm
- Add a bit more flour if you prefer thicker cookies
🔄 Variations
- Add chocolate chips for extra indulgence
- Mix in toffee bits for more caramel flavor
- Use mini chocolate marshmallows for a twist
- Add a pinch of cinnamon for warmth
🧊 Storage & Freezing
- Store in airtight container for 2–3 days
- Freeze baked cookies for up to 3 months
- Freeze dough balls and bake fresh anytime
❤️ Final Thoughts
These Brown Butter Marshmallow Crispy Cookies are the perfect mix of nostalgia and indulgence. With their crispy edges, gooey centers, and deep buttery flavor, they’re guaranteed to disappear fast.