Chocolate fudge cake recipe?

My stepmom used to make this amazing cake when i was younger, and i can't find the recipe anywhere. It was a chocolate cake, with Sander's Milk Chocolate Hot Fudge layered on top, and i think cool whip on top of that. I don't know how she made it, and I'm not really in a position to just look up her number and give her a call. Anyone know the recipe? Would i be able to just use any chocolate cake mix and whipped cream topping? Thanks for the help!