Hey guys. I have a quick question for all you baking mavens. I made this cake today as a trial-run for my boyfriend's birthday cake, just to see if it's yummy enough. I halved the recipe, because I only wanted one test layer. Well, I just took it out of the oven and the center has fallen in. Not, like, to the bottom of the pan or anything, but it's definitely got a crater shape going on. Why is that? I followed the recipe to a T, except for being stupid and adding the boiling water with the other wet ingredients instead of after. I don't think that would make so much difference, though. So what gives?