Hamburger Potato Cheese Casserole

5 large russet potatoes, peeled and sliced about 1/4-1/2 inch thick

2 -3 tablespoons chopped onions

1 lb ground beef ( really lean is preferable)

salt and pepper

Cheese sauce (the same one I use for macaroni and cheese)

2 cups milk ( I use skim)

3 tablespoons butter

3 tablespoons flour

1/2 teaspoon salt

1/2 teaspoon pepper

8 ounces shredded sharp cheddar cheese

ketchup ( optional condiment)

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