In a small bowl, mix together salt, paprika, onion powder, thyme, white pepper, black pepper, cayenne pepper, and garlic powder. Remove and discard giblets from chicken. Rinse chicken cavity, and pat dry with paper towel. Rub chicken inside and out with spice mixture. Place the onion into the cavity of the chicken. Place chickens in a resealable bag or double wrap with plastic wrap. Refrigerate overnight, or at least 4 to 6 hours.
Preheat oven to 250° F.
Place chicken in a roasting pan. Bake uncovered for 5 hours, to a minimum internal temperature of 180° F. Let stand for 10 minutes before carving.
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