3 c. sifted cake flour
3 tsp. baking powder
1/2 c. butter or other fat
2 c. of sugar
5 egg whites
1 c. milk
1 tsp. salt
1 tsp. vanilla

Conventional sponge method of mixing, cream the butter and 1/2 of the sugar, add vanilla. Sift together the flour, baking powder and salt. Add the flour and milk, alternately (add some flour first, then some milk) to the butter-sugar mixture.

Beat 4 to 5 minutes while adding flour and milk. Beat egg whites, adding remaining sugar gradually. Beat for 2 minutes. Combine this egg-sugar mixture with the batter. Bake in 350 degree oven for 30 minutes.