Twice Baked Potatoes

4 lg baking potatoes, baked
1/4 c butter
2/3 c milk
2 Tbls chopped onion
1/2 tsp salt
1/8 tsp pepper
3/4 c shredded cheddar cheese
Paprika

Cut hot baked potatoes in half.  Scoop our insides, reserve shells. 

In large bowl, with electric mixer, beat potatoes and butter until creamy.  Gradually beat in milk, stir in onion, salt and pepper. 

Spoon mixture into reserved shells.  Sprinkle with cheese.

Arrange in baking dish.  Bake at 375 for 20-25 minutes or until heated through.  Sprinkle with paprika and serve.