2 eggs, separated
1 1/2 c. sugar
2 1/4 c. cake flour
3 tsp. baking powder
1/3 c. oil
1 c. skim milk
1 1/2 tsp. vanilla

Beat egg whites until frothy. Add 1/2 cup sugar, beat until stiff. In another bowl, put in flour, remaining sugar, and baking powder. Add half of milk and vanilla. Heat 1 minute on medium speed. Scrape bowl and sides. Add remaining milk and egg yolks; beat 1 minute more. Fold in egg yolks gently. Bake at 350 degrees for 35 to 40 minutes in greased and floured 9 x 13 inch pan.