These Funfetti Marshmallow Cereal Bars are like a birthday party wrapped up in a gooey, chewy, joy-filled treat—no special occasion required. We’re talking crispy cereal coated in a buttery vanilla marshmallow melt, then studded with colorful sprinkles that bring all the fun. They’re sweet, nostalgic, and ridiculously easy to make. Whether you’re whipping them up for a bake sale, a last-minute treat, or just because you need a little extra cheer in your day, trust me—these bars deliver big smiles with every bite.
Why You’ll Love Funfetti Marshmallow Cereal Bars
This recipe isn’t just about the ingredients—it’s about creating moments. Whether you’re making them with your kids, surprising a friend, or sneaking a square for yourself after dinner, these bars are all about simple joy. Here’s why they’re a favorite:
Versatile: Great for parties, school snacks, or whenever you need a quick, colorful pick-me-up.
Budget-Friendly: Uses basic pantry staples and a bag of marshmallows—easy and affordable.
Quick and Easy: No baking required. Just melt, mix, press, and let set.
Customizable: Swap the cereal, add chocolate chips, or drizzle with white chocolate—have fun with it!
Crowd-Pleasing: Sweet, chewy, and sprinkled with happiness. Everyone loves them.

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Ingredients in Funfetti Marshmallow Cereal Bars
Here’s what makes these bars so magical:
Crispy Rice Cereal
The base of the bars—light, crunchy, and the perfect vessel for all that gooey goodness.
Mini Marshmallows
Melted into the ultimate sticky-sweet binder. Save a handful to stir in whole for extra texture.
Butter or Plant-Based Butter
Adds richness and helps everything melt into creamy perfection.
Vanilla Extract
Brings that soft bakery sweetness and enhances the marshmallow flavor.
Rainbow Sprinkles
The fun in “Funfetti”! Adds color and whimsy to every bite.
Salt (Optional)
A tiny pinch balances the sweetness and deepens the flavor.
(Note: the full ingredients list, including measurements, is provided in the recipe card directly below.)
Instructions
Let’s whip up some fun:
Preheat Your Equipment
No need to preheat anything—but line a square baking dish with parchment paper or grease it lightly to prevent sticking.
Combine Ingredients
In a large pot over low heat, melt the butter. Add most of the marshmallows (save a handful for later) and stir gently until completely smooth.
Prepare Your Cooking Vessel
Have your lined or greased baking dish ready—things move fast once the cereal goes in.
Assemble the Dish
Stir in vanilla extract, then fold in the cereal and reserved marshmallows. Gently mix until everything is evenly coated. Fold in sprinkles at the very end to avoid melting the colors too much.
Cook to Perfection
You won’t be baking, but you’ll need to quickly transfer the mixture to your prepared dish. Use a spatula or your hands (lightly greased or damp) to gently press it into an even layer.
Finishing Touches
Top with extra sprinkles if desired. Let cool at room temperature for about 30 minutes, or until set.
Serve and Enjoy
Slice into squares and serve with a big smile. These bars are ready to party!
Nutrition Facts
Servings: 12
Calories per serving: [Insert calorie count]
Preparation Time
Prep Time: 5 minutes
Cook Time: 5 minutes
Total Time: 10 minutes (plus cooling)
How to Serve Funfetti Marshmallow Cereal Bars
These bars are pure joy straight from the pan, but here are a few fun serving ideas:
Party Tray: Slice into bite-sized squares and serve with colorful toothpicks.
Dessert Platter: Pair with brownies, cookies, and fresh fruit for an easy party spread.
Lunchbox Treat: Wrap in parchment for a lunchbox surprise or after-school snack.
With Ice Cream: Serve with a scoop of vanilla for a hot-and-cold dessert twist.
Dipped in Chocolate: Half-dip the bars in melted chocolate and let set for extra indulgence.
Additional Tips
Don’t Over-Stir: Once the cereal is in, mix just until coated to keep the texture light and crispy.
Grease Your Tools: Lightly grease your spatula or hands to keep things from sticking when pressing into the pan.
Cool Completely: Let the bars set before slicing for clean, neat squares.
Use Fresh Marshmallows: Stale ones won’t melt as smoothly, so go with a fresh bag.
Add Mix-Ins: Try mini chocolate chips, crushed cookies, or freeze-dried fruit for a twist.
FAQ Section
Q1: Can I use large marshmallows instead of mini?
A1: Yes, just chop them up a bit so they melt more evenly.
Q2: Can I make these dairy-free?
A2: Absolutely! Use plant-based butter and check your marshmallows for dairy-free labeling.
Q3: How long do they keep?
A3: Store in an airtight container at room temperature for up to 4 days.
Q4: Can I freeze these bars?
A4: You can, but the texture may change slightly. Wrap tightly and freeze for up to a month.
Q5: Can I use a different cereal?
A5: Totally! Try cornflakes, Cheerios, or even Fruity Pebbles for a fun variation.
Q6: How do I keep the sprinkles from melting?
A6: Fold them in once the mixture is slightly cooler to preserve the color.
Q7: Can I add peanut butter?
A7: Yes! Stir a few tablespoons into the melted marshmallow mix for a peanut buttery twist.
Q8: What size pan works best?
A8: An 8×8 or 9×9-inch square pan gives you nice, thick bars.
Q9: Can I double the recipe?
A9: Definitely—use a 9×13-inch pan if doubling.
Q10: Are these gluten-free?
A10: If you use certified gluten-free cereal and marshmallows, yes!
Conclusion
These Funfetti Marshmallow Cereal Bars are everything you want in a quick treat—fun, festive, ridiculously easy, and bursting with nostalgia. Whether you’re making them for a celebration or just need something sweet and simple, they’ll bring a little sparkle to your day. Go ahead—grab those sprinkles and make some magic!
Print
Funfetti Marshmallow Cereal Bars
- Total Time: 15 minutes
- Yield: 12 bars 1x
- Diet: Vegetarian
Description
Colorful, chewy, and irresistibly fun, these Funfetti Marshmallow Cereal Bars are made with crispy rice cereal, gooey marshmallows, and bright rainbow sprinkles. A perfect no-bake treat for parties, lunchboxes, or anytime snacking.
Ingredients
- 6 cups crispy rice cereal (gluten-free if needed)
- 1 (10 oz) bag mini marshmallows (about 4 cups)
- 3 tbsp unsalted butter or vegan butter
- ½ tsp vanilla extract
- ¼ cup rainbow sprinkles (plus extra for topping)
Instructions
- Grease a 9×13-inch baking dish with butter or non-stick spray.
- In a large saucepan, melt the butter over low heat. Add the mini marshmallows and stir constantly until completely melted and smooth.
- Remove from heat and stir in vanilla extract.
- Quickly fold in the crispy rice cereal and rainbow sprinkles until evenly combined. Be gentle to avoid crushing the cereal.
- Transfer the mixture to the prepared pan and press down gently using a greased spatula or clean hands.
- Sprinkle additional rainbow sprinkles on top while still warm.
- Let cool completely at room temperature (about 30–60 minutes), then slice into bars and serve.
Notes
- To keep bars soft and chewy, avoid overcooking the marshmallow mixture.
- For a vegan version, use vegan marshmallows and plant-based butter.
- Store in an airtight container at room temperature for up to 3 days.
- Prep Time: 10 minutes
- Cook Time: 5 minutes
- Category: Snack
- Method: No-Bake
- Cuisine: American
Nutrition
- Serving Size: 1 bar
- Calories: 160 kcal
- Sugar: 14 g
- Sodium: 90 mg
- Fat: 4 g
- Saturated Fat: 2.5 g
- Unsaturated Fat: 1.5 g
- Trans Fat: 0 g
- Carbohydrates: 30 g
- Fiber: 0 g
- Protein: 1 g
- Cholesterol: 10 mg