Alltop.com

Why that would be Mrs. Ruth Wakefield in 1937 of course!

One day while baking, she was running low on chocolate and decided to improvise rather than running to the store. Wakefield had planned on whipping up some of her specialty "butter drop do" cookies for the guests at the Toll House Inn. The cookies called for unsweetened baker's chocolate, but the only chocolate Wakefield had handy was a bar of semisweet. So she simply broke it into chunks and mixed it into the cookie dough, assuming the chocolate would melt. When the oven timer dinged, however, she found a very different result: The bits of chocolate remained suspended in the cookies. Also, the resulting cookies were delicious!

Full articleat HowStuffWorks.com.

Total aggregation of HowStuffWorks.com.

Photo credit: Fotolia