Scalloped Potatoes - cooking recipe

Ingredients

2 lb. potatoes (6 medium)
3 Tbsp. margarine or butter
3 Tbsp. all-purpose flour
1 tsp. salt
1/4 tsp. pepper
2 1/2 c. milk
1 small onion, finely chopped
1 Tbsp. margarine or butter

Preparation

Prepare potatoes.
Cut to measure about 4 cups.
Heat 3 tablespoons of butter until melted.
Add flour, salt and pepper. Cook over low heat.
Remove from heat and stir in milk.
Heat to boiling, stirring constantly.
Boil 1 minute.
Arrange potatoes in greased casserole, 3 layers, topping each with 1/2 of the onion and 1/3 of the white sauce.
Cover and bake in a 325\u00b0 oven for 40 minutes.
Uncover and bake until potatoes are tender, 60 to 70 minutes longer.