1 chocolate fudge cake mix (or Yellow for a Twinkie Cake)
First, make 1 chocolate fudge cake mix per instructions on the box, and spread in a large greased pan, 12 x 18 x 3/4. Bake at 350 degrees for about 15 minutes. Cool.
FILLING:
5 tbsp. flour
1 stick butter
1 c. sugar
1 1/2 c. milk
1/2 c. shortening
Cook 5 tablespoons flour and 1 1/2 cups milk until thick. Let cool. Then put that in a mixing bowl with one stick butter, 1/2 cup shortening and one cup sugar. Beat on high speed until light and fluffy (about 8 to 10 minutes). Then spread this nice white fluff evenly over the top of the cake to about 1/4 inch from the edge of the pan. Chill.
HO-HO FROSTING:
1 stick butter
1 tsp. vanilla
1 1/2 c. powdered sugar
3 sq. semi-sweet chocolate, melted
2 1/2 tbsp. hot water
1 egg
Melt one stick butter and cool slightly. Add 1 egg, 3 squares semi-sweet chocolate melted, 1 teaspoon vanilla, 2 1/2 tablespoons hot water and 1 1/2 cups powdered sugar. Beat smooth by hand. Spread immediately over cake, clear to the edge of the pan. Keep in the refrigerator until served. Cut into squares.