National Chocolate Chip Day in USA
National Chocolate Chip Day in USA is held on May 15. This event in the second decade of the month May is annual. 
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Chocolate chips are a required ingredient in chocolate chip cookies, which were invented in 1937 when Ruth Graves Wakefield of the Toll House Inn in the town of Whitman, Massachusetts added cut-up chunks of a semi-sweet Nestlé chocolate bar to a cookie recipe.
The first chocolate chip cookie was the size of a quarter. Chocolate chip cookies were first called "Butterdrop Do Cookies." Wakefield's recipe first ran in a Boston newspaper.
Today, chocolate chips are very popular as a baking ingredient in the United States and the chocolate chip cookie is regarded as a quintessential American dessert.
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