Bake Duncan Hines Devil's Food Cake per package directions.
While Cake is baking, mix milk and flour in sauce pan with wire whisk. Cook over medium high heat stirring with whisk constantly until it forms a thick paste. While this cools whip again to avoid lumps in about 5 minutes.
Mix together softened butter & Crisco and beat with electric mixer for 4 minutes.
Add sugar gradually and beat for another 4 minutes.
Add cool milk and flour mixture gradually and beat for another 4 minutes. Add vanilla and almond extract at the end. This can be done to taste.