I made these over the holidays - I subbed Whey Low Granular for the sugar, but I was out of Whey Low Powdered, so I deleted that. Left everything else as is. These came out rather like a lemon tea cake, and they are delicious! I think the powdered sugar would give them more of a "crust" and would also be great.
I found another recipe online that uses cardamom (one of my favorite spices), so I'll be trying that next time.http://tastykitchen.com/recipes/desserts/lemon-crinkle-cookies/