Make a yellow cake mix according to the package directions in a 9 x 13 inch pan. Cut in half lengthwise with thread.

FILLING:

3/4 c. milk
5 tbsp. flour

Cook on medium heat until pasty, stirring constantly. Beat for a few minutes.

1 c. sugar
1/2 c. butter flavor Crisco
1/2 tsp. salt
1/2 tsp. vanilla
1/2 c. butter

Add sugar, beat until fluffy. Add each ingredients one at a time beating in between each one. Frost bottom of cake, add top and frost top and sides.