Preheat oven to 300F. Cook spiral ham for 12-15 minutes per pound, covered with foil.
While ham is cooking, add butter and sugar to a sauce pan over medium heat. Heat until melted and combined and just starting to boil.
Add in orange marmalade and stir to combine. Again bringing to a boil.
Add in cranberries. Cover, reduce heat to low and simmer for 5 minutes.
Uncover and smash the cranberries with the back of a spoon (they should be very soft by now). Stir and then set aside.
About 30 minutes before ham is done, remove ham from oven, increase oven temp to 325F. Uncover and pour over glaze. Use a brush to spread the glaze all over.
Return ham uncovered back to oven and cook the remaining 30 minutes.
When ham is done, broil on high for 3-4 minutes. Enjoy!
