Holiday Mashed Potatos

2 (3 ounce) packages of cream cheese
1 cup sour cream
2 teaspoons onion salt
1 teaspoon salt
1/4 teaspoon pepper
2 Tablespoons butter
5 pound bag of potatoes peeled, cooked and cut up.


Mash potatoes. Add all other ingredients and mix well. Can be made the day before and heated in the oven at 350 degrees for 30 minutes.