Rainbow Layer Cake with Buttercream Frosting

Preparation of the Cake Layers Preheat the oven to 350°F (175°C) and grease six 8-inch round cake pans.

Creaming the Butter and Sugar In a large bowl, cream the butter and sugar until light and fluffy. Add the egg whites one at a time, beating well after each addition. Stir in the vanilla extract.

Mixing the Batter Combine the flour and baking powder in a separate bowl. Add the flour mixture and buttermilk to the creamed mixture, alternating between the two. Mix until smooth.

Coloring the Batter Divide the batter into six equal portions. Use gel food coloring to color each portion into vibrant colors of the rainbow (red, orange, yellow, green, blue, purple).

Baking the Cake Layers Pour each colored batter into the prepared cake pans. Bake for 15-20 minutes or until a toothpick inserted in the center comes out clean. Let the cake layers cool completely before frosting.

Preparing the Buttercream Frosting In a large bowl, beat the butter until creamy. Add powdered sugar, vanilla extract, and heavy cream. Beat until smooth and creamy. Add matching gel food coloring to the frosting to complement the cake layers.

Assembling the Cake Place one cake layer on a serving plate and spread frosting on top. Repeat with the remaining layers, stacking them in rainbow order. Frost the top and sides of the cake with the remaining frosting. Enjoy!