Tender Sour Cream Waffles

1½ cups flour
¼ cup sugar
1 teaspoon baking powder
½ teaspoon baking soda
¼ teaspoon salt
3 large eggs, separated
3/4 cup sour cream
3/4 cup buttermilk
1 teaspoon vanilla
½ cup vegetable oil

Heat waffle iron. Stir together flour, sugar, baking powder, baking soda, and salt. Add egg yolks, sour cream, buttermilk, vanilla, oil, and blend well. In separate bowl, beat eggs whites until soft peaks form when beaters are lifted. Gently fold egg whites into creamed mixture until no white streaks remain. Pour 1 cup of mixture into belgian waffle maker and bake until done. (1/2 cup for regular waffle iron.)