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