Thank you for sharing this recipe -- it was exactly what I was looking for! They turned out absolutely delectably. I only had salted butter, plus didn't have a full bag of chocolate chips, so made it a 3-fer, using white chocolate chips, semi-sweet and milk chocolate chips (mostly the latter). I followed instructions to the letter (including using parchment paper, chilling for one hour, taking out of the oven so they don't overbake, etc.) and was extremely happy with the results. (I'd bought fixings for sub sandwiches, which we'd had for supper; it was a subway night at home.)