1/2 c. butter
1 c. sugar
1 egg or 2 egg yolks
1 tsp. baking powder
1 1/2 c. flour

Mix and pat into 9x12 pan. Put 1 cup each of chocolate chips, miniature marshmallows and chopped walnuts on top of mixture in pan. Beat 2 egg whites stiff. Add 1 cup brown sugar. Spread this over batter. Bake 25 minutes at 350 degrees.