Place turkey on rack in roasting pan. Brush with oil. Mix seasonings. Sprinkle 1 tablespoon of the seasonings inside the turkey. Spread remaining seasoning over entire surface and under skin of turkey. Place onion and bay leaves inside turkey. Add 1/2 cup water to pan. Cover loosely with heavy-duty foil.
Roast in preheated 325 oven 1 hour. Remove foil. Roast 2-2 1/2 hours longer or until internal temperature reaches 165 (175 in thigh), basting occasionally with pan juices. Remove turkey from oven. Let stand 20 minutes. Reserve pan juices to make gravy.