I have a confession, and that is that I got nervous about UNDER-cooking these not thinking of overcooking them. Here's a link to the recipe, with a picture of what it supposed to look like when you break it open. Notice how I don't have a picture of mine with ooey-goodness pouring out? Yeah, I overcooked it. BUT, be comforted to know that if you do the same, it still tastes GREAT! It's then just a Chocolate Cake without the Molten.
I'm definitely going to make this again, next time without overcooking it! I also did not have any instant espresso powder. Was great without, but i'm sure would be that much better with it. So make sure you have some!