(no subject)

I have: cocoa, cream, natural yoghourt, icing sugar.
I do not have: actual chocolate, butter.

I want: chocolate fudge sort of topping.

Intarwebs, please help!

ETA:

Topping for cupcakes. I've made Gordon Brown Waste-Not-Want-Not banana cupcakes, and they want something on top of them.

And the cream - irritatingly - is single cream.

But I do have egg whites.

Further ETA:

I mixed up the cream, the sugar, and some cocoa, and boiled the heck out of it until it stopped bubbling like cream and started bubbling like sugar. Now it's sort of like chocolate fudge caramel. It would actually have been quicker to go down the shop for some butter, but it was an interesting experience.