Preparation time 90mins
Cooking time 90mins
Preheat oven to 400. Bake potatoes for 1 hour. Scoop the centers out of the skins into a bowl. Mash potatoes, butter, and milk until smooth. Whip sour cream until fluffy, adding more milk if needed. Spoon mixture back into the potato skins. Top with cheese. Bake until cheese melts.