3 eggs, separated, room temperature
1 1/2 c. flour
2 tsp. baking powder
1/2 tsp. baking soda
1/4 tsp. salt
2 tbsp. sugar
3/4 c. sour cream, room temperature
3/4 c. milk, room temperature
2/3 c. butter, melted
1/2 tsp. vanilla extract

Combine flour, baking powder, baking soda,. salt and sugar; set aside. Separate eggs; beat egg whites until stiff, not dry; set aside. Stir in sour cream, milk, butter and vanilla. Stir in dry ingredients only until moistened. Gently fold in egg whites. Bake.