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Drop cookies are made from a relatively soft dough that is dropped by spoonfuls onto the baking sheet. During baking, the mounds of dough spread and flatten. Chocolate chip cookies are an example of drop cookies.
Refrigerator cookies are made from a stiff dough that is refrigerated to become even stiffer. The dough is typically shaped into cylinders which are sliced into round cookies before baking.
Molded cookies are also made from a stiffer dough that is molded into balls or cookie shapes by hand before baking. Snickerdoodles are an example of molded cookies.
Rolled cookies are made from a stiffer dough that is rolled out and cut into shapes with a cookie cutter. Gingerbread men are an example.
Pressed cookies are made from a soft dough that is extruded from a cookie press into various decorative shapes before baking. Spritzgebäck are an example of a pressed cookie.
Bar cookies consist of batter or other ingredients that are poured or pressed into a pan (sometimes in multiple layers), and cut into cookie-sized pieces after baking. Brownies are an example of a batter-type bar cookie, while Rice Krispie treats are a bar cookie that doesn't require baking, perhaps similar to a cereal bar. In British English, bar cookies are known as "tray bakes".
Fried cookies including traditional cookies such as the zeppole as well as a newer American trend of deep-frying ordinary drop cookie dough.