The Accidental Invention of the Chocolate Chip Cookie
1938
While baking cookies for her guests at the Toll House Inn, Ruth Wakefield famously ran out of baker's chocolate. She substituted it with chopped pieces of a Nestle semi-sweet chocolate bar, expecting it to melt and blend into the batter. Instead, the chocolate pieces held their shape, creating the first chocolate chip cookie. Her innovation quickly became a sensation, and people came from miles around to taste the new treat.