Instructions

1. Combine butter, sugar, egg yolks, and vanilla in a mixing bowl. Cream these ingredients together thoroughly.
2. Mix flour, salt, and baking powder together in a separate mixing bowl. Add dry ingredients to creamed ingredients 1/3 at a time alternating with adding portions of the orange juice to the creamed mixture.
3. Fold in beaten egg whites. Spoon batter into cupcake liners until 1/2 full.
4. Bake in a 350 degree preheated oven for 15 minutes or until a toothpick inserted in center comes out clean.