Stuffed Baked Potatoes

6 medium bake potatoes
1 teaspoon of salt
1/8 teaspoon of pepper or ground pepper to taste
1/4 cup of margarine or butter
1/4 cup of milk
1 cup of shredded American or Cheddar cheese

Bake potatoes as you like. Cut potatoes in half, lengthwise. Scoop potato out of shells into bowl; mash. Add remaining ingredients, except the cheese.
Beat until light and fluffy. Spoon back into shells and place in 13x9 baking dish; top with cheese. Bake at 400 degrees for 20-25 minutes or until cheese is light golden brown.