Tops of cheesecakes often crack and sink, keeping them from looking as good as they taste. To make the cheesecake prettier (and add flavor), top it with a layer of sweetened sour cream. Decrease cheesecake baking time by 10 minutes. Stir together 1 cup sour cream, 2 Tbsp. sugar, and 1 tsp. vanilla extract. Spread sour cream mixture over cheesecake, and bake 10 more minutes. Proceed with recipe as directed.