That smell wafting through my house right now? That would be this: FLOURLESS CHOCOLATE ESPRESSO CAKE WITH RASPBERRY SAUCE Recipe at Epicurious.com. OK, I'm not smelling the sauce yet, as I haven't made it, but the rest? Mmmm.
I make half a one, in a 7-inch cookie tin lined with parchment paper. I made one for Christmas and it served 8 people and half of it was left over. And it takes all of about 10 minutes to put together.