1/2 c. shortening
1/2 c. sugar
1/2. c. brown sugar
2 c. flour
1 tsp. baking soda
2 tsp. baking powder
1/2 tsp. salt (optional)
3 tsp. vanilla
3 egg yolks
3 tbsp. milk

Press dough into a greased and floured 13x9x2 inch pan. Spread chocolate chips over pressed dough. Top with mixture of 3 egg whites, beaten stiff with 1 cup brown sugar. Bake at 325 degrees for 30-35 minutes. Cool and cut into squares.