Rainbow Birthday Cake Recipe: How to Make It

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