Rainbow Layer Cake
- Parchment paper
- 2 packages white cake mix
- Water, vegetable oil and egg whites called for on cake mix boxes
- Violet food coloring gel
- Royal blue food coloring gel
- Kelly green food coloring gel
- Yellow food coloring gel
- Orange food coloring gel
- Red Food coloring gel
- 3 (16 oz.) cans ready-to-spread vanilla frosting, divided
- 2 ¾ cups powdered sugar, divided
Preheat oven to 350 degrees F. Grease 6 (8 inch) round cake pans; line with parchment paper. Prepare double batch cake mix according to package directions, using water, oil and egg whites. Divide batter evenly between 6 bowls. Stir 1/8 tsp. each of violet, blue, green and yellow coloring into 4 of the batters. Stir ½ to 1 tsp. orange into the fifth bowl, and ¾ to 1 tsp. red coloring into the sixth bowl. Pour batters into prepared pans.
Bake cake layers at 350 degrees F for 13 to 15 minutes or until a wooden pick inserted in center comes out clean. Cool in pans on wire racks 10 minutes; remove cakes from pans to wire racks, and cool completely (about 1 hour).
Beat 2 cans frosting with 1 cup powdered sugar at medium speed with an electric mixer until light and fluffy (2 to 3 minutes). Stack cake layers with 1/3 cup frosting in between each layer. With 1 ¼ cups frosting spread a thin layer of frosting on top and sides of cake.
Add remaining can of frosting and remaining 1 ¾ cups powdered sugar to remaining frosting in bowl. Beat at medium speed with electric mixer until light and fluffy (2 to 3 minutes). Divide frosting into 3 bowls. Tint 2 bowls different shades of light blue. Frost cake with deepest blue toward the bottom and white frosting on top. Use back of spoon to blend and swirl frosting.
Tested in the THASC kitchen. Photo by THASC.
THASC is a unique small American business producing cards and other promotional products.