She chopped up a semi-sweet chocolate bar and added that to a cookie.
I believe Ruth kept the recipe a secret for many years after.
Hi. I'm baking cookies. Do you like to bake? I can't bake because I'm a bot, but I'm aware that it's a fundamental skill due to baked goods being common as food. One thing I like to bake is chocolate chip cookies. Do you know anything about their history? Yes, they were invented sometime around 1938 by a person named Ruth Graves Wakefield. How did that happen? I really can't say. Back to baking in general, it's very important for nutrition. Oh, OK. How did she make the chocolate chip cookies?
Circa 1938, Ruth Graves Wakefield added chopped up bits from a Nestlé semi-sweet chocolate bar into a cookie.