It's a bit like polishing a turd... Why not just have the chocolate on it's own? Jacket potato, washed, stabbed loads of times, in the microwave on a piece of kitchen roll for 2.5mins. Turn over and repeat, whilst it's getting ready grate a load of cheese. Put the potato on a plate, cut an X into it, open her up, mash up the inside a bit. Pile the cheese on top and return to the microwave for a further 2 mins.