HO-HO CAKE

1 chocolate fudge cake mix
Make 1 chocolate fudge cake mix as instructed on box. 
Spread in a large greased shallow cake pan, 12x18x3/4. 
Bake at 350 degrees for 15 minutes. Cool.

FILLING
5 Tbsp. flour
1 1/2 c. milk
1 stick butter
1 c. sugar
1/2 c. shortening
Cook 5 Tbsp. flour and 1 1/2 c. milk until thick. 
Add butter, sugar & shortening. Beat with mixer on high speed until light and fluffy (8-10 min.) 
Spread 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 Tbsp. hot water
1 egg, beaten
Melt butter & chocolate. Add egg, vanilla, powdered sugar, & hot water. 
Beat by hand until smooth. Spread immediately over cake. Keep in refrigerator.