This is a Rick Bayless recipe. It's flourless, and it can be bake in coffee cups or mugs so that when it's garnished with whipped cream, it looks like a cup of hot cocoa.

http://www.rickbayless.com/recipe/view?recipeID=161

This is the cake I make for birthdays and special occasions. Using the highest quality dark chocolate available results in a sinfully rich cake. I've had excellent results using chili infused dark chocolate for part or most of the 12 oz. I find that it is deliciously rich without the glaze. I usually just dust the cooled cake top with confectioner's sugar. http://www.epicurious.com/recipes/food/views/5872?mbid=ipapp