The puffed rice cake is a flat hard food made with puffed rice. Typically, it is eaten as a snack or used as a base for other ingredients. While it is low in nutrients, it is generally considered to be a low-calorie food, and is often consumed among dieters as a substitute for higher-calorie breads or other food items. Some rice cakes are flavored. Common flavorings include chicken, sweet chili, cheese, butter, chocolate, caramel, salt and vinegar, or apple cinnamon. Most rice cakes are round, though square varieties are available.