1/2 c. butter
1 c. sugar
2 egg yolks
2/3 c. milk
2 c. flour
2 tsp. baking powder
1/2 tsp. salt
1 tsp. vanilla

Cream butter and sugar. Add yolks, beat well. Add milk and vanilla. Sift baking powder, flour and salt together. Add to first mixture. Beat well. Beat whites until stiff and fold in. Bake at 400 degrees for 20 minutes.