This Fruity Pebbles Cake is an easy & fun layer cake recipe made with Fruity Pebbles cereal. Festive & creative cake recipe perfect for birthdays or any occasion! Made from scratch with standard pantry ingredients and includes homemade vanilla buttercream.
Make the cereal milk: soak ½ cup Fruity Pebbles in the milk for at least 30-45 minutes. Pour the milk and cereal mixture through a strainer and discard the soggy cereal. Set cereal milk aside.
Preheat oven to 350ºF. Grease two 9-inch cake pans and set aside.
Use a handheld electric mixer or stand mixer to beat the butter and sugar together in a large bowl until light and fluffy.
In a medium bowl, stir together the flour, baking powder, and salt.
Add the egg whites and vanilla to the butter and sugar mixture. Alternate adding the flour mixture and the cereal milk to the butter and sugar until all ingredients are combined.
Stir in the remaining Fruity Pebbles.
Divide the batter between prepared cake pans. Bake cakes 25-30 minutes or until tooth pick inserted in the middle comes out clean. Cool in pan for 5 minutes then turn out onto cooling racks to cool completely.
For the homemade vanilla buttercream
Prepare the frosting while the cake is baking.
Use a hand mixer or a stand mixer to whip the 4 sticks of butter in a large bowl until light and fluffy.
Gradually add the powdered sugar to the butter, continuing to beat on low until all combined. Add the vanilla bean paste. Add a splash of milk if the frosting is too thick.
Turn the speed up and whip the buttercream until it's light and fluffy.
When the cake is fully cooled, frost it and decorate with additional Fruity Pebbles.