The Best Mashed Potatoes

Directions

1. 1
   Peel potatoes and cut them into quarters.
2. 2
   Place in cold water in a large saucepan.
3. 3
   Boil until fork-tender; drain.
4. 4
   In a large bowl, mash the potatoes with an electric mixer until smooth.
5. 5
   Add the sour cream, cream cheese, only 5 tablespoons of the butter, milk and onion powder.
6. 6
   Season to taste with salt and pepper. Turn into a greased baking dish and dot with the remaining butter. The casserole can be baked immediately or covered and kept in the refrigerator up to 48 hours.
7. 7
   To serve, bake uncovered at 400° until heated through and lightly browned, about 30 minutes.
8. 8
   If chilled, bring the casserole to room temperature before baking.