1. Preheat oven to 425º. Place potatoes on a baking sheet. Bake at 425º for 1 hour or until soft. Let cool; peel. Place potatoes in a large mixing bowl.
2. Heat cream and butter in a small saucepan until butter is melted. Add cream mixture and remaining ingredients to potatoes. Mash together with a spoon or fork until liquid is absorbed.
3. Spoon into a 2-quart baking dish. Bake at 350° for 10 minutes or until warm. Serve immediately.