Make-Ahead Mashed Potatoes

Step 1

Preheat the oven to 325 degrees F (165 degrees C).

Step 2

Place potatoes in a large pot of lightly salted water. Bring to a boil, and cook until tender, about 15 minutes. Drain, and mash.

Step 3

In a large bowl, mix mashed potatoes, cream cheese, sour cream, milk, onion salt, and pepper. Transfer to a large casserole dish.

Step 4

Cover, and bake for 50 minutes in the preheated oven.