Potatoes On The Half Shell

Directions

1. 1
   Preheat oven to 350 F degrees.
2. 2
   Scrub the potatoes and place them in the oven until done, about 1 hour.
3. 3
   Cut each potato in half, lengthwise. Carefully, scoop out the potato and place in a bowl. Set the potato shells aside to use later.
4. 4
   While still hot, mash the potatoes with the milk, beaten egg, and butter. Beat until fluffy.
5. 5
   Season with salt and pepper, to taste. Add in the onion.
6. 6
   Spread the potato shells with butter and fill each shell with the potato mixture.
7. 7
   Sprinkle the tops with parmesan cheese.
8. 8
   Bake until tops are browned.