Lynn's Recipes - Rainbow Cake

Ingredients

• 3 cups flour
• 4 teaspoons baking powder
• ½ teaspoon salt
• 1 cup butter, softened
• 2-1/2 cups sugar
• 5 egg whites
• 1 teaspoon vanilla
• 1-1/2 cups milk
• Red, orange, yellow, green, blue and purple food coloring
• 3 cups powdered sugar
• 1 cup butter
• 1 Tablespoon cream