Potatoes
Onions
3 tbsp. butter
1/4 c. flour
salt to taste
pepper to taste
1 c. milk
1 can cream of chicken soup
1/4 c. mayonnaise

Melt butter. Add flour, salt and pepper. Add milk and stir to thicken like gravy. Add soup and mayonnaise. Layer peeled and sliced potatoes and onions in dish. Pour sauce over.

Bake at 350°F for 75 minutes.