In the United States and Canada a cookie is a small, flat, sweet baked treat, usually containing flour, eggs, sugar, and either butter, cooking oil or another oil or fat, and often including ingredients such as raisins, oats, chocolate chips or nuts. Cookies may be mass-produced, made in small bakeries or home-made. Cookie variants include using two thin cookies with a creme filling (e.g., Oreos) and dipping the cookie in chocolate or another sweet coating.