The muffin may have toppings added, such as cinnamon sugar, streusel, nuts, or chocolate chips. It is sometimes topped with a streusel topping. They are rarely topped with a streusel topping. The whole cake is sprinkled with sugar or streusel. They may also feature a streusel or simple glaze topping, if any. The term is also sometimes used for rich pastries topped with, or mixed with, streusel.