[header] How to heat fully cooked ham [title] Slice the ham into pieces. [step] The size of the slices are up to you, but they should be sliced thin enough that they're ready to serve. You can slice up the entire ham, or you can do a bit at a time if you're not serving many people at once. 
[title] Place the ham slices in a shallow baking dish and cover with foil. [step] The foil will help to keep any moisture released from the ham slices inside the dish, which helps prevent the ham from drying out.