A cake is a form of sweet dessert that is typically baked. Typical cake ingredients are flour, sugars, eggs, butter, oil or margarine, milk, wat, and leavening agents such as baking soda or baking powder. Common additional ingredients and flavorings include dried candied, fresh fruit, nuts, cocoa, and extracts such as vanilla, with numerous substitutions for the primary ingredients. Cakes can also be filled with fruit preserves, nuts, or dessert sauces (like pastry cream), iced with buttercream or other icings, and decorated with marzipan and piped borders.