Rainbow Layer Cake
Make a rainbow layer cake for that very special event coming up. You can use any colors you wish in your layer cake. Great with ice cream.

Ingredients
Cake
- 8 ounces white baking chocolate, chopped
- 2 1/4 cups all purpose flour
- 2 1/4 teaspoons baking powder
- 1/4 teaspoon salt
- 10 Tablespoons butter, at room temperature
- 1 1/3 cups granulated sugar
- 4 eggs
- 1 1/2 teaspoons vanilla
- 1 1/4 cups milk
- Food colorings (yellow,light green, red, dark green, orange)
Creamy Butter Frosting
- 2/3 cup butter
- 1/2 teaspoon salt
- 1 teaspoon vanilla extract
- 7 cups confectioners sugar, sifted
- 4 to 8 tablespoons milk or light cream, or enough to make smooth and spreadable
Directions
Cake
- Preheat oven to 350 degrees F.
- Grease the bottoms of five 8-inch round cake pans.
- Line bottoms of pans with parchment paper, grease and lightly flour pans. Set aside.
- If you do not have five cake pans, then you will need to bake the cake layers in batches.
- In a medium saucepan, cook and stir the 8 ounces white chocolate over low heat until melted.
- In a medium sized mixing bowl, combine flour, baking powder, and salt, set aside.
- In a large mixing bowl, beat the butter with an electric mixer on medium to high speed for 30 seconds. Gradually add the granulated sugar, beating until combined.
- Add eggs one at a time, beating after each addition. Beat in the 1 1/2 teaspoons vanilla.
- Alternately add flour mixture and milk to butter mixture, beating on low speed after each addition just until combined.
- Beat in melted white chocolate just until combined. Once the cake batter is mixed, divide the batter into 5 bowls.
- Add food coloring to each bowl of batter. We used yellow, light green, red, dark green and orange for this cake, but you can use any colors you would like.
- Spread batter in the prepared cake pans.
- Bake about 20 minutes or until a toothpick inserted in the centers comes out clean.
- Cool cake layers in pans on wire racks for 10 minutes.
- Remove layers from pans. Peel off parchment paper. Cool completely on wire racks.
- *Note If you are cooking in batches, just wash your cake pans, reline with parchment paper, grease and sprinkle flour, then proceed with next batch of cakes.
Frosting
- Cream butter, salt, and vanilla, beating with an electric mixer until light and fluffy. Add the confectioners sugar gradually, beating after each addition.
- Add 3 tablespoons milk or light cream, beating until smooth. Beat in more milk until desired spreading consistency is reached and the frosting is spreadable.
- Makes about 4 2/3 cups of frosting, enough to frost tops and sides of the Four - 8 inch layer cakes.
Assembly
- Use about 3/4 cup of frosting in between layers.
- To assemble, put one layer (top up) on cake plate. Spread about 3/4 cup of the frosting on top.
- Place another layer on top (bottom side up), spread 3/4 cup of frosting on top.
- Place the third layer and spread 3/4 cup of frosting.
- Place the fourth layer and 3/4 cup frosting.
- Place final layer of cake and frost the entire cake sides and top.
- It is easiest to spread a thin layer on cake first, then frost again, using a spatula to spread on the remainder of the frosting.
- Add garnish if you like.