Au Gratin Potatoes

1 Tbsp butter

1 onion, thinly sliced

2 Tbsp all purpose flour

2 cups milk

2 pounds uncooked Yukon gold potatoes, thinly sliced

1 cup shredded cheddar cheese

1 tsp salt

1/4 tsp pepper

Preheat oven to 375.  Coat a 2 quart covered dish with cooking spray.  Melt butter in skillet.  Add onion and cook, stirring occasionally, until onion begins to brown, about 5 minutes.  Stir in flour; add milk slowly, stirring constantly.  Add potatoes and stir to mix.  Bring to a boil.  Stir in 3/4 cup of cheese, salt and pepper.  Pour mix into dish and level out surface.  Bake for 1 hour, uncovered.  Cover and bake until potatoes are fork tender, about 20 minutes more.  Change temperature to broil.  Sprinkle rest of cheese over potatoes.  Broil 6 inches from heating element until cheese is golden brown.

Serves 8