To cook a spiral ham in the oven, follow these general guidelines:

• Preheat your oven to 325°F (163°C).
• Place the precooked spiral ham cut-side down in a roasting pan.
• Cover the ham tightly with foil to retain moisture.
• Bake the ham for about 12 to 15 minutes per pound.
• Use a meat thermometer to check the internal temperature; heat until it reaches 140°F (60°C).
• For example, a 10-pound ham will take approximately 2 to 2.5 hours.
• If you plan to glaze the ham, apply the glaze during the last 15 to 20 minutes of cooking after removing the foil, then bake uncovered to allow the glaze to caramelize.
• Let the ham rest covered for about 15 minutes after removing it from the oven before slicing and serving.

This method ensures the ham is heated through without drying out and allows for a nicely caramelized glaze if desired