I hate to give up on this recipe because it really produces a nice flavored cake but it is sunken in the middle. I think it is something to do with the leavening and need some input. It is baked in a loaf pan and overflows slightly so I'm getting a good initial rise. I'm thinking that I need to cut back on the baking soda and add a little baking powder to sustain the rise. Here's the ingredients: 1 c boiling water 4 oz chocolate 2 c flour 1t baking soda 1/2 c butter 1 3/4 c brown sugar 2 egg 1 t vanilla 1/2 c sour cream (I've also subbed buttermilk) I'm also thinking about cutting back the water to 3/4 c as I think that should be enough to melt the chocolate. Any thoughts would be much appreciated!