RE: Favorite Christmas Cookie
The favorite Christmas cookies from my youth were Krumkaka and Fattigman. Both were baked by my Norwegian grandmother.
My current favorite is Tabach or Welsh cookies (grilled not baked) which are being made by my wife as I type.
Christmas cookies are, I suppose, those that are made only at Christmas. My all-time favorite cookies are the "warm-from-the-oven" Tollhouse and Oatmeal Raisin; both of which are also made at Christmas. pb