In the 1930s, Ruth Wakefield of the Toll House Inn ran out of baker’s chocolate while making cookies. She improvised by chopping up a Nestlé semi-sweet bar, expecting it to melt into the dough.

Instead, the chunks held their shape, creating gooey pockets of chocolate—and the chocolate chip cookie was born.

The recipe was a hit, and Nestlé made a sweet deal: they printed her recipe on their packaging in exchange for a lifetime supply of chocolate. They even invented chocolate chips to make baking easier.