Heat oven to 325°F. Spray shallow roasting pan or 15x10x1-inch pan with cooking spray. Place ham, fat side up, on rack in shallow pan. Score outside of ham in diamond pattern; insert cloves into diamond shapes. (To make inserting cloves easier, use small paring knife or toothpick to make small holes before inserting cloves.) Insert ovenproof meat thermometer in thickest part of ham. Bake 1 hour.