This colorful Fruity Pebbles cake recipe makes my cereal-loving heart so full! Moist funfetti cake layers, rich Fruity Pebbles-infused frosting, and colorful cereal pieces turn a box mix into an easy yet impressive cake. It’s a cheerful, crowd-pleasing dessert that’s perfect for birthday parties or any occasion that calls for a little whimsy.
Cake Mix Funfetti Cake Decorated with Fruity Pebbles Cereal
This Fruity Pebbles cake is colorful, fun, and surprisingly easy. I use boxed cake mix to keep the layers moist and save time, and I fold sprinkles into the batter to give each bite a little pop of sweetness. The frosting is rich and buttery, and Fruity Pebbles cereal adds a nostalgic crunch that makes every slice playful and flavorful.
The texture contrast of soft, fluffy cake with the crunchy Fruity Pebbles cereal topping gives this birthday cake a fun, whimsical feel that kids and adults alike will love. It’s easy enough for beginners, but with a few simple tricks, you’ll have a cake that looks professionally made!
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Chill Layers for Easy Decorating
I always chill my cake layers before frosting. This firms them up, making trimming, stacking, and decorating much easier and preventing frosting from slipping. I like to do a thin crumb coat first to trap any stray crumbs, then finish with a thicker layer of frosting for a clean, professional look.
Fruity Pebbles Cake Recipe
Equipment
- Kitchen Scale (optional)
- 3 8-inch Round Cake Pan(s)
- Hand Mixer or Stand Mixer
- Piping Tip Set (optional)
Ingredients
For the Cake
- 39.75 ounces white cake mix (3 (13.25-ounce) boxes)*
- 1⅓ cups buttermilk room temperature**
- 14 tablespoons unsalted butter melted (1¾ sticks)
- ½ cup vegetable oil
- 3 large eggs room temperature
- 2½ teaspoons pure vanilla extract
- ¾ cup rainbow sprinkles ***
For the Frosting
- 5 cups powdered sugar
- 1½ cup unsalted butter slightly melted (3 sticks)
- 1 tablespoon pure vanilla extract
- 3 cups Fruity Pebbles cereal ****
Instructions
For the Cake
- Preheat oven to 350°F. Grease three 8-inch round cake pans. Set aside.
- Mix the cake mix, buttermilk, butter, oil, eggs, and vanilla in a large bowl.39.75 ounces white cake mix, 1⅓ cups buttermilk, 14 tablespoons unsalted butter, ½ cup vegetable oil, 3 large eggs, 2½ teaspoons pure vanilla extract
- Gently fold in the sprinkles until fully mixed.¾ cup rainbow sprinkles
- Divide the cake batter evenly between the prepared cake pans (about 676 grams per pan).
- Bake for 33-35 minutes, or until a toothpick inserted in the middle of the cakes comes out clean.
- Remove the cakes from the oven and let cakes cool in pans for 15 minutes before removing cakes from pans then placing on wire racks to finish cooling.
- Once the cakes have completely cooled, wrap each layer in plastic wrap and refrigerate for 2 hours to firm up.
For the Frosting
- In the bowl of a stand mixer fitted with the whisk attachment, beat the powdered sugar, butter, and vanilla extract on high speed until light and fluffy, about 5 minutes.5 cups powdered sugar, 1½ cup unsalted butter, 1 tablespoon pure vanilla extract
For Assembly
- Remove the cakes from the fridge and cut the dome tops off to level, if needed.
- Place a thin layer of frosting (about 2 tablespoons) in the middle of a cake board or cake plate, then place one cake (cut side facing up) on top of that frosting.
- Add a generous layer of frosting on top of that first layer, smooth it out evenly, then place the second layer (cut side facing up again) on top of the first layer.
- Add a generous layer of frosting on top of that second layer, smooth it out evenly, then place the third layer (bottom side facing up) on top of that frosted second layer.
- Frost a thin layer of frosting around the top and sides of the cake, then freeze for 10 minutes to firm up.
- Remove about 1½ cups of white frosting and place it into an icing bag fitted with a Wilton 1M tip. Set aside.
- Stir 2 cups of Fruity Pebbles cereal into the remaining white frosting.3 cups Fruity Pebbles cereal
- Frost the chilled cake with the Fruity Pebbles frosting, using a cake scraper to smooth it out.
- Gently press about ¾ cup of the remaining Fruity Pebbles onto the bottom border of the cake.
- Use the white icing in the icing bag with the Wilton 1M tip on it to frost swirls around the top border of the cake. Sprinkle with the remaining ¼ cup of Fruity Pebbles cereal.
Notes
- Use room-temperature eggs and buttermilk for a smoother batter.
- Fold in the sprinkles gently to avoid a dense, chewy cake.
- Divide the batter evenly for uniform layers.
- Let the cakes cool completely before wrapping to avoid condensation.
- Whip the frosting for a full 5 minutes for maximum fluff.
- Crumb-coat with frosting for a cleaner finish.
- Avoid crushing the Fruity Pebbles when decorating the borders.
How to Make Fruity Pebbles Funfetti Cake with Cake Mix Step-by-Step
Mix the Batter: Preheat your oven to 350°F. Spray three 8-inch round cake pans with nonstick spray and line the bottoms with parchment paper–this makes it much easier to remove the cakes later without breaking them. Set the pans aside while you mix your batter. In a large bowl, combine 39.75 ounces (3 boxes) of white cake, 1⅓ cups of room-temperature buttermilk, 14 tablespoons of melted unsalted butter, ½ cup of vegetable oil, 3 large room-temperature eggs, and 2½ teaspoons of vanilla extract. Using room-temperature eggs and buttermilk helps everything mix smoothly and keeps the cake light.
Portion the Cakes: Once your wet and dry ingredients are mostly combined, gently fold in ¾ cup of rainbow jimmies-style sprinkles–avoid overmixing here to prevent a dense, chewy cake. Divide the batter evenly between the three prepared pans (about 676 grams per pan if you want to be precise). Smoothing the batter evenly ensures the layers bake at the same rate.
Bake and Cool the Cakes: Bake your Fruity Pebbles cake layers in the preheated oven for 33–35 minutes, or until a toothpick inserted in the center comes out clean. Let them cool in the pans for about 15 minutes, then carefully remove them and transfer to a wire rack to cool completely. Once fully cooled, wrap each layer in plastic wrap and chill in the fridge for 2 hours. Chilling firms up the layers, making them much easier to trim and frost.
Make the Frosting: While the cakes chill, whip up your frosting. In a stand mixer fitted with the whisk attachment, beat 5 cups of powdered sugar, 1½ cups of slightly melted unsalted butter, and 1 tablespoon of vanilla extract on high speed for about 5 minutes. This extra whipping makes the frosting light, fluffy, and easy to spread.
Level and Prep the Cake Layers: After chilling, use a serrated knife to trim any domed tops so each layer is flat. Flat layers stack better and prevent a lopsided cake. Place a small dollop of frosting (about 2 tablespoons) in the center of your cake board or plate, then set the first layer on top, cut side facing up. This base helps the cake stay in place while you frost.
Stack the Layers: Spread a generous layer of frosting over the first layer, smoothing it evenly. Place the second layer on top (cut side up), then repeat with another generous frosting layer and the third layer (bottom side up this time). You can do a crumb coat here–apply a thin layer of frosting around the cake and chill for 10 minutes. This traps crumbs so your final frosting layer looks clean.
Decorate the Cake: Remove about 1½ cups of frosting and put it into a piping bag with a Wilton 1M tip. This will be for decorative swirls later. Stir 2 cups of Fruity Pebbles into the remaining frosting. Frost the chilled cake with this Fruity Pebbles frosting, smoothing the top and sides with a bench scraper. Gently press ¾ cup of the leftover Fruity Pebbles along the bottom border of the cake (avoid crushing the cereal). Pipe swirls using the reserved white frosting on the top border, then sprinkle the remaining ¼ cup Fruity Pebbles over the top.
How to Store and Freeze
Store leftover Fruity Pebbles cake in an airtight container at room temperature for up to 2 days, in the refrigerator for up to 4 days, or in the freezer for up to 1 month. Let thaw overnight in the refrigerator before enjoying at room temperature.
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