Wash and bake the number the baking potatoes needed for your party. When tender, immediately cut a slice off the top of each potato and very carefully remove the potato from the skin. Set the skins aside and whip the potatoes with milk, butter, sour cream and seasonings. Put the whipped potatoes back into the skins, piling the potato above the top of the skin a bit. When ready to serve, place the potatoes on a cookie sheet and return them to the oven to warm through. These can be prepared early in the afternoon and then popped back into a hot oven about a half hour before your dinner is served. You can sprinkle a bit of paprika on top for color if you want.