Baked Mashed Potato Casserole

5 pounds potato
6 ounces cream cheese
1/2 cup half and half
1/2 cup sour cream
1/2 cup butter
salt and pepper to taste

Peel and boil potatoes. Drain and mash. Then beat with mixer. Add in the remaining ingredients and beat until the consistancy of mashed potatoes. Pour into a casserole dish. Drizzle mellted butter on top. Bake at 350 degrees for about 30 minutes.