6 to 8 potatoes
2 tbsp. onions, chopped
1/2 pt. sour cream
Butter
Parmesan cheese

Cook potatoes. Mash with onion and sour cream. Put in greased casserole. Put butter pats on top (be generous with butter). Cover with Parmesan cheese. Refrigerate overnight. Remove 1/2 hour before cooking. Bake at 350 degrees for 30 minutes or until warm.