Au Gratin Potatoes

4 russet potatoes, sliced into 1/4 inch slices
1 onion, sliced into rings
salt and pepper to taste
3 tablespoons butter
3 tablespoons all-purpose flour
1/2 teaspoon salt
2 cups milk
2 cups shredded Cheddar cheese
From http://allrecipes.com/recipe/15925/creamy-au-gratin-potatoes/

1. Preheat oven to 400 degrees F (200 degrees C). Butter a 1 quart casserole dish.

3. In a medium-size saucepan, melt butter over medium heat. Mix in the flour and salt, and stir constantly with a whisk for one minute. Stir in milk. Cook until mixture has thickened. Stir in cheese all at once, and continue stirring until melted, about 30 to 60 seconds. Pour cheese over the potatoes, and cover the dish with aluminum foil.
4. Bake 1 1/2 hours in the preheated oven.

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