Ingredients
2 1/4 cups cake flour
1 Tablespoon baking powder
1/2 teaspoon salt
1 1/4 cups buttermilk
4 egg whites
1 1/2 cups sugar
2 teaspoons lemon zest
1 stick butter, room temperature
1 teaspoon lemon extract
3/4 cup rainbow sprinkles
Marshmallow Buttercream (plus a teaspoon of lemon extract)
Preparation
