Make-Ahead Mashed Potatoes - cooking recipe

Ingredients

6 medium potatoes (2 lb.)
1/2 (8 oz.) carton sour cream
1 (3 oz.) pkg. cream cheese, cut up
1 Tbsp. margarine or butter
1 tsp. onion salt
1/4 tsp. pepper
1/4 to 1/2 c. milk

Preparation

Cook potatoes until tender; drain.
Mash potatoes with remaining ingredients.
Dot with butter and bake at 350\u00b0 for 45 minutes.