3/4 c. butter
1 c. brown sugar, packed
4 egg yolks
2 1/2 c. all purpose flour
1 tsp. baking powder
1 c. sour milk
1 tsp. baking soda
2 egg whites, beaten stiff
1 tsp. vanilla
2 egg whites
1 c. brown sugar, packed
1 c. ground walnuts

Cream butter and 1 cup brown sugar thoroughly. Add egg yolks; beat well. Combine flour and baking powder and add, alternately, with mixture of sour milk and soda. Fold in 2 stiffly beaten egg whites and vanilla. Pour into greased 9 inch square pan. Beat remaining 2 egg whites until frothy. Gradually beat in remaining brown sugar until stiff. Spread over batter. Sprinkle with nuts. Bake at 325 degrees for 30 minutes or until cake tests done.