PLACE potatoes in large saucepan. Add broth; bring to boil. Cover; cook 15 min., stirring after 8 min. Uncover; simmer on medium-low heat 5 to 6 min. or until potatoes are tender and most the broth is absorbed.
ADD Neufchatel; mash potatoes on low heat just until Neufchatel is melted. Add sour cream and Parmesan; mash and stir until potato mixture is blended and heated through.