Mashed Potato Casserole

5 lbs. or 12 medium potatoes
8 oz. cream cheese
1 cup of half and half (I usually use 1/2 cup, depending on the consistency of the potatoes)
1/2 cup of butter or margerine
1 tsp. onion salt
1 tsp. seasoned salt
1 tsp. salt
1 tsp. pepper

Boil potatoes and mash. Combine all ingredients and put in butter casserole (9x13). Brush with butter and paparika.Bake 350 degrees for 45 min.