Preheat the oven to 325°F
Place the ham in a baking dish
Add a little water, broth, or glaze to keep it moist
Cover tightly with foil
Heat until the internal temperature reaches 140°F
Baste occasionally if desired
Let it rest for a few minutes before slicing
Reheat slices in a skillet over low heat if needed
Microwave individual slices on low power in short intervals
Avoid overheating to prevent drying out