Makes 18 large cookies.

I've used both 365 organic powdered sugar from Whole Foods, and Hain organic powdered sugar with success. I prefer to use non-alkalized cocoa powder (Scharrfen Berger or Dagoba) but also tested with Droste, which is a Dutch-process cocoa powder. All with success. On the nut front, be mindful of how you toast your walnuts - it's the single factor that impacts the personality of these cookies most. Using deeply toasted walnuts makes for a much more intense, nutty cookie. Lightly toasted walnuts can sometimes be mistaken for chocolate chips, and make for a much more mild cookie. Both good! Also, cooking time - you don't want to over or under bake here - over bake, and your cookies will cool too a crisp, under bake, and they are too floppy and crumbly. Also, underbaking makes it more difficult to remove the cookies from the parchment paper after baking - you get the swing of it after a batch or two. Use large eggs, I suspect if you use extra-large, the batter will run, and you'll have to compensate with more powdered sugar.