Bake cake according to directions on box. Bake in 9x13 inch pan lined with waxed paper. Cool 10 minutes. Flip cake onto wire rack and use a thread or unflavored unwaxed dental floss, to cut cake lengthwise. Put bottom of cake back in pan and spread the filling mixture on it and replace top of cake. Frost cake with choice of icing or dust with powdered sugar.
To make filling, combine flour and water in a saucepan; cook over medium heat until thickened. Cool in refrigerator. Combine sugar, margarine, vanilla and shortening in a mixing bowl. Beat until fluffy; combine the flour mixture with the sugar mixture.
By Robin from Washington, IA
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