No stick cooking spray
1 1/2 c. flour
1 c. sugar
1/2 c. unsweetened cocoa
1/4 c. Argo cornstarch
1/2 tsp. baking soda
1/4 tsp. salt
4 egg whites
1 c. water
1/2 c. Karo light or dark corn syrup

Preheat oven to 350 degrees. Spray 9 inch square baking pan with spray. In large bowl combine dry ingredients until well mixed. In medium bowl whisk egg whites, water and corn syrup. Stir into dry ingredients until smooth. Pour into prepared pan. Bake 30 minutes or until cake springs back when lightly touched. Cool on wire rack for 10 minutes.