Hi Saralyn;
I found this on the internet by typing Make-Ahead Mashed POtatoes into a search
engine.
Make-Ahead Mashed Potatoes

5 Lb. baking potatoes
2 Pkg. (3 oz.) cream cheese (more if desired, room temp.)
1 Container (8 oz.) 1/3 less fat sour cream
1/2 Cup butter or margarine, room temperature
1/2 Cup milk
2 Tsp. onion salt
Salt and pepper to taste
Chopped or dried parsley for garnish

Peel potatoes and cut into cubes. Cook in boiling salted water 15-20 minutes or
until tender. Drain well. Mash potatoes. Add cream cheese, sour cream, butter,
milk and onion salt. Beat at medium speed with electric mixer until smooth and
fluffy. Do not overbeat. Spoon in a lightly greased 9x13 pan or 3 quart baking
dish. May be baked, covered at 325 deg. for 50 minutes or until thoroughly
heated. Serves 8 to 10.

*Note: After combining everything, it may be chilled up to 2 days. To bake, let
stand at room temperature 30 minutes before baking.