Chocolate Cupcake Quest

I was desperate to make Mint Filled Chocolate Cupcakes.

So I searched for a cupcake recipe that used cocoa powder rather than chocolate.
I first tried Nigella's Easy Peasy Cupcakes. They certainly were easy and they rose very well but I found them to be without character.
So I then tried the Basic Chocolate Cupcake from the book Vegan Cupcakes Take Over the World (recipe at http://www.chow.com/recipes/10794)- these weren't what I was after either. Oh well, the quest continues!