Preheat oven to 400ºF.
Pierce the potatoes in several places with a fork.
Place potatoes on the middle rack of the oven and bake for 45 minutes, or until they are soft all the way through when pierced with a fork. Remove from oven and let cool for 10-15 minutes.
Cut each potato lengthwise and carefully scoop out insides with a spoon.
In a large mixing bowl, blend potatoes, butter and cream with a whisk or hand mixer until light and airy. Vegetables should be finely chopped, then mixed with potato mixture, salt, and pepper.
Place filling into each skin halve, and return to the oven for 3-5 minutes.
Top with sour cream, cheddar cheese, or your favorite garnish.