Prep and Cook Time: about 1 1/4 hours. Notes: To toast the hazelnuts, place whole nuts in an 8- or 9-inch-wide pan and bake in a 350° oven, shaking pan occasionally, until golden brown under skins, 10 to 12 minutes. Pour nuts onto a clean kitchen towel and rub to remove loose skins; lift nuts from towel, leaving skins behind. When nuts are cool, whirl in a food processor or blender to grind. Store these cookies airtight for up to 1 week.