Do first! 1 c. milk 1 stick butter, room temp. 1 c. granulated sugar 1/2 c. Crisco 2 tsp. vanilla
Mix cake mix according to package directions. Bake on 2 cookie sheets or 1 large pan, greased and wax papered.
Cook flour and milk until it becomes a thick paste. Let cool completely. Put in refrigerator. Mix together butter, sugar, Crisco and vanilla. Add cooled paste to this mixture and beat 4 to 5 minutes. Return to the refrigerator. After cake is cooled, spread on bottom layer of cake, add top layer. May frost if desired. (If baked in large rectangular pan, cut cake in half and spread the filling between layers, lengthwise.)