Scalloped Potatoes

2 Quarts of Potatoes, Sliced
1 Large Onion, Sliced in Rings

White Sauce:

1/4 Cup Margarine, Melted

1/4 Cup Flour

2 1/2 Teaspoons Salt

4 1/2 Cups Milk

1/4 Teaspoon Pepper

Blanch sliced potatoes in boiling water for 3 minutes. Drain off the water. Place potatoes in the bottom of a 9x13 baking pan. Cut one large onion in rings and place on the top of the potatoes.

Combine the ingredients for the white sauce. Stir together until it comes to a boil. BE CAREFUL. Do NOT scorch. Do NOT cook white sauce on high. You will need to stir the white sauce constantly while it cooks. Pour white sauce over potatoes.

Bake at 350 degrees for 30-45 minutes.