Rainbow Layer Cake

This bright, multihued cake is a festive addition to any party. For a full-color effect, dye the layers to match a rainbow or let your imagination[ take flight. Create your own palette by tinting the cake layers to coordinate with the jimmies, nonpareils, or dragees of your choice.]

Yield:
1 six-layer cake
Ingredients
  • 6 egg whites (about 2/3 cup), at room temperature
  • 1 cup sugar, divided
  • 1 cup (2 sticks) unsalted butter, at room temperature
  • 3 tablespoons applesauce
  • 2 teaspoons pure vanilla extract
  • 2 whole eggs
  • 2 1/4 cups cake flour
  • 2 teaspoons baking powder
  • Pinch salt
  • 6 different hues of food coloring
  • 2 cups Buttercream Frosting*
  • 2 cups rainbow sprinkles, nonpareils, and/or pearl dragees
  • *Jams, jellies, and other fillings also work well.
Directions

Preheat oven to 350 degrees F. Line six 6-inch cake pans with parchment paper.

Beat egg whites with an electric mixer on medium-high speed until foamy, about 2 minutes. Increase mixer speed to high and continue beating until soft peaks form, about 3 minutes. Gradually add 1/2 cup of the sugar, continuing to beat until stiff peaks form, about 3 minutes more.

In another large mixing bowl, cream butter and the remaining 1/2 cup of sugar on medium speed until light and fluffy and increased in volume, about 5 minutes. Add applesauce, vanilla, and eggs and mix on medium speed for 1 minute more.

Sift together flour, baking powder, and salt. Add to butter mixture and mix on medium speed for 1 minute. Pour in 3/4 cup water and mix to combine. Fold in egg whites with a large spatula.

Divide batter evenly among 6 small bowls. Starting with the lightest color, tint batter with food coloring, whisking in a few drops at a time until the desired intensity is reached. Pour each of the colored batters into a different parchment-lined cake pan (each should be half full) and bake until a toothpick inserted in the center comes out clean, about 12 to 15 minutes.

Stack layers according to the colors of the rainbow, spreading a thin layer buttercream between each. Using an offset spatula, frost the whole cake with a thin layer of buttercream.

Place cake on a freezer-safe plate. Freeze for 15 minutes, or until buttercream is firm. Remove from freezer and cover cake in sprinkles.

See how to cover a cake in sprinkles.


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