Peanut Butter Brownies
["1/3 c. butter or margarine", "1/2 c. peanut butter", "1 c. sugar", "1/4 c. brown sugar", "2 eggs", "1 c. sifted flour", "1 tsp. baking powder", "1/4 tsp. salt", "1 (6 oz.) pkg. semi-sweet chocolate chips", "1/2 tsp. vanilla", "1 1/2 c. sugar", "1 Tbsp. cornstarch", "1 c. cake flour", "12 egg whites", "dash of salt", "1 tsp. cream of tartar", "1 tsp. vanilla"]
["Separate eggs.", "Beat the whites until frothy.", "Add salt and cream of tartar; continue beating until eggs are stiff.", "Add the cornstarch to sugar and fold into egg whites, then fold the flour into the eggs, small amount at a time.", "Bake 35 minutes at 375\u00b0."]
["butter", "peanut butter", "sugar", "brown sugar", "eggs", "flour", "baking powder", "salt", "semi-sweet chocolate chips", "vanilla", "sugar", "cornstarch", "cake flour", "egg whites", "salt", "cream of tartar", "vanilla"]