I saw these be made on America's Test Kitchen. I've made them now several times and are so good and so simple to make. I like to make them especially when I am out of chocolate chips and it's a nice change from that. The recipe calls for dark brown sugar, which I'm adding, but I tend to buy the light brown sugar and they still taste fine with it if that's all you buy too. I'm sure the dark brown sugar will have more of a butterscotch taste. Also, I like to make smaller cookies since I have small kids, and it comes up to about 4-5 dozen. When the cookies were made on the show, they made pretty big cookies and made 2 dozen.