A snickerdoodle is a type of cookie made with butter or oil, sugar, and flour, and rolled in cinnamon sugar. Eggs may also sometimes be used as an ingredient, with cream of tartar and baking soda added to leaven the dough. Snickerdoodles are characterized by a cracked surface and can be crisp or soft depending on preference.
Snickerdoodles are often referred to as "sugar cookies". However, traditional sugar cookies are often rolled in white sugar whereas snickerdoodles are rolled in a mixture of white sugar and cinnamon.
The Joy of Cooking claims that snickerdoodles are probably German in origin, and that the name is a corruption of the German word Schneckennudel ("snail noodles"), a kind of pastry. It is also possible that the name is simply a nonsense word with no particular meaning, originating from a New England tradition of whimsical cookie names.