Mashed Potatoes Royale

Directions

1. 1
   Cook and mash potatoes with a little less milk than usual. Add regular butter, salt and pepper.
2. 2
   Stir in sour cream, Parmesan cheese and garlic salt to taste (may add 1 cup grated Cheddar).
3. 3
   Pour into buttered 11 x 7-inch casserole.
4. 4
   Cover and refrigerate all day or overnight.
5. 5
   Uncover.
6. 6
   Bake in preheated oven at 350° for 45 minutes.
7. 7
   May be frozen before baking. Longer standing improves flavor.