Here are some problem-solving tips to keep in mind when baking cakes: Keep your cake smooth, not cracked on top. Put your cake on a middle rack in the oven. That keeps it from forming a "crusty top" too quickly. Make sure it's done! For most cakes, insert a cake tester or a wooden skewer and see if it comes out clean. If it does, it's done. For sponge cakes, gently touch them. They should be sort of "springy." Don't be tempted to open that oven door and check on your cake too soon. Do that and your cake will sink like the Titanic. Keep it moist - use the correct amount of baking powder. Too much and your dessert will be a desert.