Preheat oven to 350.
Place potatoes in a saucepan; add water to cover. Bring to a boil; cover, reduce heat, and simmer 15 minutes or until tender. Drain.
Combine potatoes, cream cheese and next 4 ingredients in a bowl; beat at medium speed of a mixer 2 minutes or until smooth. Spoon into an 11x7-inch baking dish coated with cooking spray; drizzle margarine over potato mixture. Sprinkle with paprika. Bake, uncovered, at 350 degrees for 30 minutes.