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 .
Chocolate chips were invented in 1937 when Ruth Graves Wakefield of the Toll House Inn added cut-up chunks of a semi-sweet Nestlé chocolate bar to a cookie recipe .