As seen on America's Test Kitchen, this revamped chewy cookie has deep toffee/butterscotch undertones. They highy recommend Ghiradelli 60% cacoa bittersweet chips or Hershey's Special Dark chips. It is important to bake one tray at a time for proper baking, and these are developed to make large cookies - 4-5" across. You'll have to use 3Tbsp of dough per cookie, giving 2" around each dough mound to allow for spreading. Cool cookies ON THE COOKIE SHEET for 30 to 60 minutes for the ideal cookies.