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Prepare cake batter according to package directions; pour into a Pam sprayed
15 x 10 x 1 inch baking pan. Bake at 350 degrees for 20-25 minutes or until a toothpick inserted near the center comes out clean. Cool on a wire rack. Meanwhile, for filling, combine flour and milk in a saucepan until smooth. Bring to a boil over medium heat, stirring frequently. Cook and stir for 2 minutes; remove from the heat and cool completely. In a mixing bowl, cream butter, shortening, sugar and salt until fluffy. Add flour mixture; beat until fluffy; about four minutes. Spread over cake. Freeze for 15 minutes. For frosting. beat butter, cocoa and vanilla in a mixing bowl until fluffy. Beat in sugar
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