Chocolate chip
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. Lots of people liked the new cookies, and Wakefield made an agreement in 1939 with Nestlé to put her recipe on the chocolate bar's packaging. In return, Nestlé gave Wakefield a lifetime supply of chocolate.