Make Ahead Mashed Potatoes

Directions

1. 1
   Cook the potatoes; mash well.
2. 2
   Add the sour cream, cream cheese, onion salt and garlic salt; mix well.
3. 3
   Put in greased casserole dish.
4. 4
   Put in refrigerator; let set overnight.
5. 5
   Before baking, dot with butter (do not stir).
6. 6
   Cover; bake in a 350° oven for 1 hour.
7. 7
   Uncover; let top brown slightly.