2 lbs. potatoes
3 tbsp. butter
3 tbsp. flour
Salt and pepper
2 1/2 c. milk
1/4 c. finely chopped onion
1 tbsp. butter

Heat oven to 350 degrees. Wash potatoes; pare thinly and remove eyes. Cut into thin slices. Melt butter in saucepan over low heat. Blend in flour and seasonings. Cook over low heat, stirring until mixture is smooth and bubbly. Remove from heat; stir in milk. Heat to boiling, stirring constantly. Boil and stir 1 minute.

In greased casserole, arrange potatoes in 2 layers, topping each with half the onion and 1/3 of the white sauce. Dot with 1 tablespoon butter. Cover; bake 30 minutes. Uncover; bake 60-70 minutes or until potatoes are tender. Let stand 5-10 minutes before serving.