In lg saucepan, combine cream cheese, milk, salt and pepper; stir over low heat until smooth. Add potatoes and chives; mix lightly. Spoon into 1 1/2 quart casserole; cover. Bake 350 deg, 1 hour, 10 mins or until potatoes are tender. Stir before serving. Can make this ahead but don't cook, refrigerate. When ready to serve, bake as directed.