Now, I haven't made a cake or anything along those lines in quite some time... and, after making this cake, I know why... you could easily stand over the kitchen sink in a very Miranda Hobbes versus the chocolate cake battle, eating slice after slice, completely forgoing the plate and even the fork.
Here is Nigella's Chocolate Gingerbread... courtesy of her cookbook, Feast. It is wonderfully complex with the ginger warmth and chocolate sweet.
I reduced the amount of chocolate chips and used the mini ones. A) Because it was all that I had but B) that, for me, was the perfect amount of chocolate. I also reduced the cooking time by 5 minutes... I think the cake would have been dry otherwise, so keep an eye on it around the 40 minute mark.
One substitution... I did not have any ginger ale and wasn't braving the cold for a mere 60 mLs, so I used 60 mLs of sparkling water with a scant 1/2 tsp of powdered ginger dissolved into it. Seemed to work just fine!
Other than that, the recipe uses a frightening amount of sugar, so just forget that and enjoy the treat, remembering that you don't do this that often... ;)