Because your ham is fully cooked, you’re technically just reheating it. But food safety is non-negotiable: use an instant-read thermometer to ensure the thickest part reaches 140°F. This guarantees it’s hot enough to be safe without being overcooked.
Insert the thermometer into the center of the ham, away from the bone, and avoid touching the fat. If you hit the bone, the reading will be off. This is a tiny step that separates a good cook from a great one.
Effortless Oven Techniques: How To Perfectly Reheat A Fully Cooked Ham