18 oz. pkg. white cake mix
1/2 c. Argo - Kingsford cornstarch
1/2 c. firmly packed brown sugar
3 egg whites
1 c. water
1/2 c. mayonnaise
1 c. chopped walnuts
1 c. heavy cream, whipped

Grease and flour two (9 inch) round cake pans. In large bowl with mixer at medium speed beat first 7 ingredients; pour into pans. Bake at 375 degrees for 25 to 30 minutes. Let cool 10 minutes. Split each layer horizontally. Fill with custard filling. Frost with whipped cream.