Chocolate chips were created with the invention of chocolate chip cookies 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 Nestlé brand Toll House cookies is named for the inn.) The cookies were a huge success, and Wakefield reached an agreement in 1939 with Nestlé to add her recipe to the chocolate bar’s packaging in exchange for a lifetime supply of chocolate. Initially, Nestlé included a small chopping tool with the chocolate bars. In 1941, Nestlé and at least one of its competitors started selling the chocolate in “chip” (or “morsel”) form.

Originally, chocolate chips were made of semi-sweet chocolate, but today there are many flavors. These include bittersweet, peanut butter, butterscotch, mint chocolate, white chocolate, dark chocolate, milk chocolate, and white and dark swirled chips.