What do they make chocolate out of?

The chocolate chip cookie, also known as the Toll House Cookie, was accidentally developed by Ruth Graves Wakefield, owner of the Toll House Inn near Whitman, Massachusetts, in 1933. Wakefield was making chocolate cookies but ran out of regular baker's chocolate and substituted broken pieces of semi-sweet chocolate, assuming it would melt and mix into the batter. It did not, and the cookie with chips of chocolate was born. (The restaurant, housed in a former toll house built in 1709, burned down in 1984.) Wakefield sold the recipe to Nestlé in exchange for a lifetime supply of chocolate chips. Every bag of Nestlé chocolate chips in North America has Wakefield's original recipe printed on the back.