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In the United States and Canada, a cookie is a small, flat baked cake (Commonwealth English biscuit).
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Its name derives from the Dutch word koekje which means little cake, and arrived in the English language via the Scots language, rather than directly from the Dutch. In Scottish English the word denotes a small scone-like cake or bun, often filled with cream.
The word cookie in English English is used mainly to identify American-style biscuits such as "Chocolate-Chip Cookies". Cookies were first made from little pieces of cake batter that were cooked separately in order to test oven temperature. The ancestor of the cookie is said to have come from Persia according to many sources. (example) 2 Today it is becoming increasingly common to annually celebrate December 4th as 'Cookie Day.'
They can be baked until crisp or only long enough that they stay soft, depending on the type of cookie. Some cookies are not cooked at all. Cookies are made in a vast variety of styles, using an array of possible ingredients including sugars, spices, chocolate, butter, peanut butter, nuts or dried fruits.
A general theory of cookies may be formulated this way. Despite their descent from cakes and other sweetened breads, the cookie in almost all its forms has abandoned water as a medium for cohesion. Water in cakes serves to make the base (in the case of cakes called 'batter') as thin as possible, which allows the bubbles – responsible for a cake's fluffiness – to form better. In the cookie the agent of cohesion has become some variation of the theme of oil. Oils, be they in the form of butter, egg yolks, vegetable oils or lard are much more viscous than water and evaporate freely at a much higher temperature than water. Thus a cake made with butter or eggs instead of water is far denser after removal from the oven.
Oils in baked cakes do not behave as water in the finished product. Rather than evaporating and thickening the mixture, they remain, saturating the bubbles of escaped gasses from what little water there might have been in the eggs, if added, and the carbon dioxide released by heating the baking powder. This saturation produces the most texturally attractive feature of the cookie, and indeed all fried foods: crispness saturated with a moisture (namely oil) that does not sink into it.
Obviously there is some variation in that some cookies are purposely undercooked to retain a water-moist center.
Cookies are broadly classified according to how they are formed, including at least these categories:
Commercially-produced cookies include many varieties of sandwich cookies filled with marshmallow, jam, or icing, as well as cookies covered with chocolate which may more closely resemble a type of confectionery.
Bars or bars can mean: