except milk and cheese in 3-quart saucepan over medium-low heat until vegetables are very tender, about 1-1/2 hours. Carefully pour mixture into workbowl of food processor fitted with steel blade or into blender container. Cover and process until smooth. Return mixture to saucepan; stir in milk and cheese. Heat over medium heat, stirring constantly, until cheese is melted and mixture is hot. 5 Servings.