This is such an easy dish to make for Thanksgiving. It can be made up to 3 days ahead and cooked the day of Just remember to bring it to room temperature before putting it in the oven.
Mashed Potato Casserole
5 lbs potatoes (about 8 large)
1 (8 oz) package cream cheese (thawed)
1 cup sour cream
2 tsp garlic salt
½ tsp pepper
¼ cup butter
Cook and mash potatoes. Beat cream cheese and sour cream until smooth; gradually add to potatoes. Beat in garlic salt and pepper. Put into buttered shallow casserole dish (9x13 works great). Dot with butter. Bake, covered at 400 for 50-60 minutes.
May refrigerate up to 3 days. Bring to room temperature before baking.