Rainbow Birthday Cake

"How fun is this rainbow birthday cake? It will add a festive touch to any celebration. Be sure to use gel food coloring for the most vibrant look. —Taste of Home Test Kitchen..."

INGREDIENTS
1 cup butter, softened
2-1/2 cups sugar
4 large eggs, room temperature
4 cups all-purpose flour
3 teaspoons baking powder
1 teaspoon salt
1/2 teaspoon baking soda
1-1/2 cups sour cream
6 different colors gel food coloring
FROSTING:
2 cups butter, softened
6 cups confectioners' sugar, sifted
2 teaspoons vanilla extract
1/4 to 1/3 cup heavy whipping cream
Sprinkles
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