Mashed Potatoes with Ham with parmesan

2 1/2 lbs baking potatoes , such as Yukon Gold, peeled and cut into 2 inch cubes 1/4 teaspoon salt 1/2 cup skim milk 2 tablespoons butter or 2 tablespoons[...]

6 large baking potatoes , peeled, cut crosswise into thirds (about 4 1/2 pounds) 1 garlic clove , minced very finely 1 large onion , peeled, cut in half[...]