Smashed Potatoes with Goat Cheese and Scallions

Place potatoes in a pot and cover by an inch or two with cold water. Heat water to a boil, add salt, then reduce heat to a steady simmer and cook potatoes until tender, about 15 minutes. (They will be done when a knife point inserted to the center meets no resistance.) If preparing a menu, leave potatoes in the water until 5 minutes before serving. Break goat cheese into small pieces in a large bowl, mix in margarine. Drain potatoes. Transfer the potatoes to the bowl. Immediately mash the potatoes and then beat with an electric beater to mix them with the margarine and cheese, adding enough milk to reach the desired consistency. Stir in scallions and serve.