Au Gratin Potatoes

1		spray(s) cooking spray
1  tablespoon		salted butter
1		medium uncooked onion(s), thinly sliced
2  tablespoons		all-purpose flour
2  cups		fat-free skim milk
2  lb.		uncooked yukon gold potato(es), thinly sliced
1  cup		low-fat shredded Cheddar cheese
1  teaspoon		table salt
1/4  teaspoon		black pepper

Tip: For nutritional information on all the ingredients in Au Gratin Potatoes just click on each ingredient name. Then adjust the serving size for any Au Gratin Potatoes ingredient with the serving size tool in the nutrition facts area to the right to see how you can save calories, carbs and more.

Preheat oven to 375°F. Coat a 2-quart covered baking dish with cooking spray.


Melt butter in a large pot over medium heat. Add onion and cook, stirring occasionally, until onion begins to brown, about 5 minutes. Stir in flour; add milk slowly, stirring. Add potatoes and stir to mix. Bring to a boil. Stir in 3/4 cup of cheese, salt and pepper.


Pour mixture into prepared baking dish and level out surface. Bake for 1 hour, uncovered. Cover and bake until potatoes are fork-tender, about 20 minutes more.


Change oven temperature to broil. Sprinkle remaining cheese over potatoes. Broil 6 inches from the heating element until the cheese is golden brown, about 1 to 2 minutes. Allow to cool for 5 minutes before slicing into 8 pieces.