Brownie, Marshmallow, and Rice Krispies Recipe: Fudgy Layers with Gooey Crunch

This brownie, marshmallow, and Rice Krispies recipe delivers the ultimate dessert trifecta—rich fudgy brownie layers, gooey marshmallow fluff, and crispy Rice Krispies topping. The secret lies in baking the brownie base just until set, then layering it with melted marshmallows and the iconic crunchy cereal.

I developed this recipe after years of perfecting the balance between dense brownie texture and that signature Rice Krispies crunch.

What makes this dessert truly special is the combination of textures: the dense, moist brownie at the bottom provides a sturdy foundation, while the marshmallow layer adds sweetness and chewiness.

The Rice Krispies topping delivers that satisfying crunch with every bite, creating a perfect contrast. This recipe is foolproof and delivers restaurant-quality results without requiring any special equipment.

Ingredients for brownie marshmallow rice krispies

Rich brownie layers meet gooey marshmallow fluff and crispy Rice Krispies topping—this trifecta delivers restaurant-quality texture contrast.

The cocoa powder makes all the difference here. Dutch-processed creates a smoother, more velvety brownie texture—Hershey's Special Dark is my go-to brand. For the marshmallows, Kraft Jet-Puffed gives that perfect balance of gooeyness and structure. Rice Krispies? Original flavor only—the other varieties add unwanted sweetness or flavors. If you can't find Dutch-processed cocoa, regular will work, but the brownie will be slightly more bitter. The butter should be cold when you measure it—this prevents the brownie from becoming too cakey.

No Dutch-processed cocoa? Natural cocoa powder plus 1/4 tsp baking soda mimics the effect. Marshmallows too expensive? Mini marshmallows from the bulk section are often cheaper. For a gluten-free version, swap the all-purpose flour for a 1:1 gluten-free blend. The chocolate chips can be omitted if you prefer a classic Rice Krispies treat—just add 1/4 cup extra marshmallows. If you're feeling fancy, fold in white chocolate chips or crushed pretzels for added texture contrast. The key to the perfect texture is baking the brownie just until set—overbaking will make it too dry for the marshmallow layer.

Store the assembled trifle in an airtight container in the fridge for up to 4 days. The brownie base keeps well for 3 days separately, while the marshmallow topping can be prepped a day ahead and refrigerated. For a showstopper presentation, dust with powdered sugar and garnish with extra chocolate chips right before serving. This dessert reheats beautifully—pop it in the oven at 300°F for 10 minutes to revive the marshmallow layer. Freeze the brownie base only for up to 2 months—never freeze the assembled dessert as it will make the Rice Krispies soggy.

Step-by-step instructions for brownie, marshmallow, and Rice Krispies dessert

Layering rich brownie, gooey marshmallows, and crispy cereal creates a decadent dessert with perfect texture contrast.

Preheat your oven to 350°F and line a 9x13-inch baking pan with parchment paper, leaving an overhang for easy removal. In a large mixing bowl, melt the 1 cup unsalted butter over low heat, then whisk in the 2 cups granulated sugar and 0.75 cup unsweetened cocoa powder until smooth. Remove from heat and stir in the 1 cup all-purpose flour, 1 tbsp vanilla extract, 2 whole large eggs, and 0.5 tsp salt.

Pour the brownie batter into the prepared pan and spread evenly. Bake for 20-25 minutes until a toothpick inserted in the center comes out with moist crumbs (not wet batter). Let the brownie cool completely in the pan before proceeding—this prevents it from crumbling when you add the marshmallow layer. The edges should be set but still slightly fudgy in the center.

In a medium saucepan, combine the 4 cups miniature marshmallows and 0.5 cup heavy whipping cream. Cook over low heat, stirring constantly with a wooden spoon, until the marshmallows melt completely and the mixture reaches a smooth, pourable consistency. This should take about 5-7 minutes—watch closely to avoid burning. Remove from heat and let cool slightly for 2 minutes to thicken slightly.

Pour the marshmallow mixture evenly over the cooled brownie base, spreading it into the corners with a spatula. Sprinkle the 0.5 cup dark chocolate chips over the marshmallow layer. Chill the pan in the refrigerator for 20 minutes to allow the marshmallow to set but remain slightly soft. This step ensures the marshmallow stays gooey rather than rubbery when sliced.

In a large bowl, combine the 3 cups Rice Krispies cereal and 0.5 cup powdered sugar. Stir gently to distribute the powdered sugar evenly—this prevents a sugary coating in just one spot. Pour the cereal mixture over the marshmallow layer, pressing down lightly with a spatula to help it adhere. The cereal should cover the entire surface evenly, with no gaps showing the marshmallow underneath.

Return the assembled dessert to the refrigerator for an additional 15 minutes to allow the layers to meld together. This final chilling ensures the Rice Krispies stay crisp and the marshmallow remains soft. Once set, carefully lift the dessert from the pan using the parchment overhang. Cut into squares or rectangles for serving.

Essential equipment for this dish

Baking Pan Essentials

You'll need a 9x13-inch baking pan for the brownie base—I recommend a light-colored metal pan like Wilton's Perfect Results for even heat distribution. The pan should have low sides (about 2 inches) to make layering easier.

If you don't have one, a glass baking dish works too, but it may require 5-10 extra minutes in the oven. 🧈

Line the pan with parchment paper—I use half-sheet pans from Reynolds—and leave 2-inch overhangs on all sides. This makes removal effortless and prevents brownie crumbs from sticking to your counter. Trust me, this small step saves 10 minutes of cleanup later.

Mixing Tools

A large mixing bowl (at least 3-quart capacity) is essential for the brownie batter. I use OXO Good Grips because the non-slip base prevents spills when whisking hot butter.

For the marshmallow layer, grab a medium saucepan with low sides—I prefer Calphalon for its even heating. A wooden spoon is crucial for stirring marshmallows without burning them.

Don't skimp on a good spatula—I use Silpat's flexible silicone spatula for spreading the marshmallow layer evenly. It glides smoothly and won't scratch your pan. For the Rice Krispies topping, a large bowl (at least 4-quart) ensures enough room to mix without spills.

A light dusting brush helps distribute powdered sugar evenly on the cereal.

Measuring Precision

Accurate measurements are key, especially for the cocoa powder and marshmallows. Use a digital kitchen scale for the cocoa—Hershey's Special Dark should weigh 3 ounces for ¾ cup. For marshmallows, a dry measuring cup packed lightly gives 4 cups from a 12-ounce bag.

A liquid measuring cup with spout works best for the heavy cream and powdered sugar.

I keep my measuring cups in a magnetic holder on the fridge—it's a $10 game-changer that keeps them organized and within reach. For the Rice Krispies, use a standard measuring cup and level it with a knife for consistent portions.

The chocolate chips can be measured by volume, but I weigh them for precision—2.5 ounces equals ½ cup.

Optional Extras

For a showstopper presentation, invest in a sharp chef's knife (I use Mercer Culinary) and cutting board for clean slices. A small offset spatula helps with garnishing—dusting powdered sugar through a fine-mesh sieve creates that professional look.

If you're making this ahead, a clear plastic wrap keeps the layers fresh in the fridge.

For vegan adaptations, you'll need vegan marshmallows (like Dandies) and vegan butter (I recommend Miyoko's). A high-quality whisk helps incorporate air into vegan batters.

The Rice Krispies remain the same, but the brownie texture will be slightly denser without eggs. Keep all tools separate to avoid cross-contamination with dairy products.

Frequently asked questions