This is my husbands favorite cookie ! His Mom, Betty, made these a lot and after she passed away I found the recipe. It was handwritten on a sheet of notebook paper, the edges are all crinkly and brown and it has lots of stains from vanilla and flour I imagine. She had made a note to add the butterscotch chips to the recipe and I later on added the sour cream for extra moistness. They really are sooo good, you can't eat just one !