Use any chocolate cake mix, baked as directed in 9×13 pan.  Cool completely.  Cut in large circles using a  glass

Filling – beat 1 cup shortening 2 minutes.  Blend in 1 1/2 cups powered sugar that has been lifted.  Add 1 1/2 cups marshmallow cream.   Blend in 1 tsp vanilla then a few tsp of milk or heavy cream.

Ganache – bring 1/2 cup heavy cream and 4 tbs sugar to a boil.  Remove from heat.   Whisk in 1 cup chocolate chips until melted.  Stir in 1 tbs butter until melted