Coconut Triple-Layer Cake

INGREDIENTS

• Cooking spray
• 1 tablespoon cake flour
• 3 1/2 cups sifted cake flour
• 2 teaspoons baking powder
• 3/4 teaspoon salt
• 1/2 teaspoon baking soda
• 1 3/4 cups sugar
• 1/4 cup butter or stick margarine, softened
• 1 1/2 tablespoons vegetable oil
• 2 large egg whites
• 1 2/3 cups fat-free milk
• 1/2 cup plain fat-free yogurt
• 2 1/2 teaspoons vanilla extract
• 1/4 teaspoon butter extract
• Fluffy Coconut Frosting
• 2/3 cup flaked sweetened coconut