Sometimes there's nothing better than the simplest of flavors. We both love these cookies as they are or with a simple glaze, or we sprinkle demerara sugar on them for a bit of sparkle. If you add 1 tablespoon of cream of tartar to the dry ingredients and roll them in cinnamon sugar prior to baking, you will have classic snickerdoodles. With orange or lemon zest, they can easily be nudged in other directions. When we lived in New York, there was a little bakery, now gone, called Mary's Off Jane. She made the most incredible lime shortbread-ish cookies with a lime glaze that we devoured. These come close, but we have yet to re-create them to her standard.