Your best bet is to supply us with a recipe. Usually, cakes sink in the middle due to too much leavening or an inappropriate ratio of leavening to acid. It could be the sour cream you are using is more acidic than what you used before. Also, whomever is measuring your ingredients could be sloppy. Supply us with the recipe and we can probably help you figure it out.
9/24/13 at 6:17am