Cook potatoes, covered, in a small amount of boiling lightly salted water for 20 to 25 minutes or until tender.
Meanwhile, in a small saucepan melt butter over medium heat. Add garlic and cook for 2 minutes. Stir in milk, salt and pepper. Cover and keep warm on very low heat. (Do not scorch.)
Drain potatoes; return to pan. Mash with potato masher. Stir in warm garlic-milk mixture. Fold in cheese. Cover and let stand 5 minutes to allow the cheese to melt. Serve with Braised Duck (see Recipe Center). Makes 8 servings.