First, the cake should have a golden brown color on the top and around the edges. You may also use the toothpick method to determine if the cake is baked. Insert a toothpick into the center of the cake. If it comes out clean or with a few crumbs clinging to it, it's a good sign that the cake is fully baked. If the toothpick comes out with wet batter, it needs more time in the oven.