Steps

1. Preheat oven to 350 °F. Grease and flour two 8-inch round cake pans.
2. Sift together dry ingredients.
3. Cream butter and sugar until fluffy, about 5 minutes.
4. Stir in milk, vanilla extract, and flour mixture. Beat briefly until smooth.
5. Whip egg whites to soft peaks. Slowly add sugar and continue to whp unti stiff peaks.
6. Stir 1/3 egg whites into batter, then fold in the rest.
7. Portion evenly into the two pans.
8. Bake until tests done, about 20-25 minutes.
9. Remove from oven and put on a cooling rack5 minutes, then remove cakes from pans cool completely on the rack.