This is such a moist, creamy cake, that it can be tricky to know when it's done baking. The cake is done when it's just starting to pull away from the sides of the pan. If you gently shake the pan, the center shouldn't wobble like jello, but appear to be set. If you insert a toothpick in the center of the cake, it should come out without any raw, liquid batter on it. The toothpick will not be clean - you're just looking for signs of raw batter. If you're still unsure, know that it's better to slightly under bake this cake than over bake it.