preheat oven to 350 f
wash and pat chicken dry, remove the giblets
In a small bowl, combine the thyme, shallots, salt, and pepper- rub mixture under the skin of the chicken
Place the onions in a roasting pan (with a lid) , top with the chicken, skin side up. Pour the wine and balsamic vinegar over the chicken. Place the lid back on the dish. Bake covered for 1 hour.
Remove the lid and bake for another 1 hour, or until a meat thermometer reads 180 f. The chicken will be nice and brown! Let stand for 15 minutes before carving.
Pour the onion sauce into a small bowl and skim off the fat, and serve