Make Ahead Tip: Cover and refrigerate the cookie dough for up to 1 day. Store baked cookies airtight in a single layer for up to 3 days or freeze for up to 3 months.
White whole-wheat flour is made from a special variety of white wheat that is lighter in color and flavor but has the same nutritional properties as regular whole-wheat flour. It is available at large supermarkets and natural-foods stores and online at bobsredmill.com or kingarthurflour.com. Store it in the freezer.
To toast and skin whole hazelnuts: Spread on a baking sheet and bake at 350°F, stirring occasionally, until fragrant and lightly browned, 7 to 9 minutes. After toasting, let hazelnuts cool for a few minutes, then rub together in a clean kitchen towel to release most of the papery skins.
Find clear (or white) sanding sugar (aka sparkling or coarse sugar) in well-stocked baking stores, gourmet food shops or online at kingarthurflour.com.
1 other carbohydrate, 1/2 fat