Remove the one (7- to 10-pound) spiral-sliced, bone-in half ham from the packaging and discard the plastic disk that covers the bone. Place the ham in the plastic oven bag, tie the bag shut, and trim the excess plastic. Set the ham, cut-side down, in a roasting pan or 13-by-9-inch baking dish and cut 4 slits in the top of the bag.☞ TESTER TIP: Alternatively, if you don't have an oven bag, place the ham, cut-side down, in the roasting pan or baking dish and wrap the ham and pan tightly with foil.) Let the ham rest at room temperature for 1 1/2 hours.