Bright, playful, and nostalgic—Rainbow Marshmallow Dream Bars are the dessert equivalent of a good mood. These bars are made with just a handful of ingredients, but they pack a punch in flavor, color, and texture. Think crispy, chewy, buttery bites filled with the magical combination of Fruity Pebbles and marshmallows, all in a sliceable, giftable, party-ready bar.

This recipe was made for celebrations. Whether you’re prepping for a birthday bash, school party, or just want to spread a little happiness on a random Tuesday, these bars bring the fun. They’re a modern, rainbow-hued twist on classic marshmallow treats, and they’ve been engineered to hold their shape so you can stack, share, and store them with ease.

At the heart of these treats are Fruity Pebbles cereal and mini marshmallows—two ingredients that might remind you of your favorite childhood breakfasts, now reimagined into a dessert that even grown-ups can’t resist. The marshmallows get melted down into a creamy base that binds the colorful cereal into a firm yet chewy structure that holds together perfectly once cooled.

We’ve made this recipe with texture and sliceability in mind. By using a controlled marshmallow-to-cereal ratio and folding in extra unmelted marshmallows at the end, we strike the perfect balance between gooey and firm. It’s soft enough to bite easily but structured enough to hold a clean edge.

What really sets this version apart is the addition of kosher salt—a small detail that makes a huge difference. It brings out the flavors, balances the sweetness, and gives these bars a slightly more sophisticated twist.

They’re also fast. Like, one-bowl, ten-minutes-of-effort fast. No baking required, and all the work happens on the stovetop. The hardest part is waiting for them to cool before slicing—though we wouldn’t blame you if a few spoonfuls disappeared during the process.

These bars are incredibly easy to customize too. Want to add sprinkles on top? Go for it. Prefer marshmallows in fun shapes? That works too. Drizzle with white chocolate or cut into shapes with cookie cutters for themed parties. The sky’s the limit.

Kids can help make them (with adult supervision near the stove, of course), and they’ll definitely want to help eat them. They’re allergy-friendly as well—no nuts, no eggs—and you can easily sub in dairy-free butter to make them vegan.

One of the best things about these Rainbow Marshmallow Dream Bars is their portability. You can cut them into small squares for a lunchbox surprise or bigger bars for bake sales. Wrap them individually for party favors or stack them high on a dessert tray—they’ll always get noticed.

They store beautifully in an airtight container for days and freeze surprisingly well too. So if you somehow end up with leftovers (rare, but it happens), you’re covered.

The bright colors and sparkly sheen make these bars ideal for social media moments, too. Perfect for Pinterest, Instagram, or any feed that needs a little joy.

In short, these bars are fun to make, fun to eat, and even more fun to share. They’re a crowd-pleaser, a conversation starter, and a nostalgic treat with a grown-up upgrade.

Servings: 20 bars

Time:

Prep Time: 10 minutes
Cook Time: 10 minutes
Cool Time: 30 minutes
Total Time: 50 minutes

Ingredients:

10 tablespoons unsalted butter, cubed
16 cups mini marshmallows, plus 4 cups extra for folding in
14 cups Fruity Pebbles cereal
1/2 teaspoon kosher salt
Non-stick cooking spray (for pan)

Instructions:

Line a 9×13-inch pan with parchment paper or foil and lightly spray with non-stick cooking spray.
In a large pot over medium heat, melt the butter completely.
Add 16 cups of mini marshmallows and stir constantly until melted and smooth.
Stir in the kosher salt.
Remove from heat and immediately fold in the Fruity Pebbles using a rubber spatula.
Quickly fold in the remaining 4 cups of mini marshmallows for pockets of chewy texture.
Pour mixture into prepared pan and press evenly using a greased spatula or wax paper.
Let cool at room temperature for at least 30 minutes.
Once firm, lift from the pan and slice into even bars using a sharp knife.
Store in an airtight container at room temperature for up to 5 days.

Tips:

Lightly butter or spray your hands or spatula to prevent sticking.
For cleaner slices, chill bars for 10 minutes before cutting.
Use parchment for easy lift-out and less mess.
Mix in extra cereal or marshmallows for texture variation.

Why You’ll Love This Recipe:

These bars are bright, colorful, and packed with flavor. They’re easy to make, slice beautifully, and stay firm without sacrificing the soft chew that makes marshmallow treats so addicting.

Rainbow Marshmallow Dream Bars are colorful cereal treats made with Fruity Pebbles and marshmallows, designed for firmer texture and easy slicing. Perfect for parties, gifting, or a quick fun dessert, they’re a vibrant, nostalgic snack that everyone will love.