Combine gluten free rub ingredients. Rub seasoning mixture over entire turkey and into cavities.
Set seasoned turkey in a roasting pan. Cover with plastic wrap and refrigerate overnight.
Preheat oven to 400 degrees. Stuff turkey with gluten free dressing, if desired. (Place remaining dressing in a lightly oiled casserole dish. Cover and bake according to recipe instructions.)
Combine glaze ingredients and brush over turkey. Truss the bird or cover stuffed cavities with aluminum foil to prevent burning. Place in preheated oven and bake for 20 minutes. Reduce oven temperature to 325 degrees and roast 3 to 3½ hours, basting* frequently with pan drippings until a meat thermometer registers 180 degrees in the thickest part of the thigh. (If turkey is not stuffed, cooking time will be slightly less. Begin checking for doneness after 3 hours.)
Remove turkey from oven and let stand 10 minutes before carving. Remove gluten free stuffing to a serving dish. Serve with hot gluten free gravy.
TIP Baste turkey with gluten-free chicken stock the first few times until enough juices collect in the pan.