Rainbow Layer Cake
From eclectic recipes via betty crocker.com.
Steps
Heat oven to 350f spray 3 round cake pans with cooking spray.
In large bowl , beat cake mix , water , oil and eggs with electric mixer on low speed 30 seconds , then on medium speed 2 minutes , scraping bowl occasionally.
Divide batter evenly among 6 small bowls , about 1 1 / 3 cups each.
Using food colors , tint batter in 1 bowl blue , 1 bowl red , 1 bowl green , 1 bowl yellow , 1 bowl orange and 1 bowl purple.
Refrigerate 3 colors of batter until ready to bake.
Pour remaining 3 colors of batter into cake pans.
Bake 18 to 20 minutes or until cake springs back when touched lightly in center and begins to pull away from side of pan.
Cool 10 minutes.
Remove from pans to cooling racks.
Cool completely.
Wash cake pans.
Bake and cool remaining 3 cake layers as directed.
In large bowl , beat shortening and butter with electric mixer on medium speed until light yellow.
On low speed , gradually beat in powdered sugar.
Beat in vanilla.
Add milk , 1 tablespoon at a time , beatin.
Ingredients
vanilla cake mix, water, vegetable oil, eggs, food coloring, shortening, butter, powdered sugar, vanilla extract, milk