My husband BEGS me to make these constantly! They are so good, my whole family eats them up. There are NEVER any leftovers! Prep time includes baking potatoes the first time. Not the healthiest recipe, so I only make them 4 or 5 times a year.
Bake potatoes in oven until easily pierced with fork.
(I do not recommend microwaving them, it makes the skin very soft and potatoes will fall apart when stuffing) Cut off, lengthwise, top 1/3 of potatoes.
Scoop out potato with spoon into a medium mixing bowl, leaving shells intact.
Add butter, cheese, salt, and pepper to potatoes.
Blend with a hand-held mixer, adding milk a little bit at a time until mixture is creamy but still pretty thick (you may not need all of the milk, or you may need more, depending on the potatoes used, how long they were baked, etc.).
Using a spoon, scoop potato mixture back into emptied shells.
It is ok if the potatoes are stuffed over the top.
Bake in a 375 oven for 20-25 minutes, or until cheese is bubbly and potatoes are brown on top.