
Ingredients
Directions
1.
PREHEAT oven to 350°.
2.
In a small saucepan over medium heat, MELT butter; STIR in flour, salt and pepper until smooth.
3.
Gradually WHISK in milk; BRING to a boil, STIRRING constantly; COOK, STIRRING, until thickened, about 2 minutes.
4.
REMOVE from heat; STIR in cheese until melted.
5.
COAT an 8-insquare baking dish with cooking spray; PLACE half of the potatoes in dish; LAYER with 1/2 cup onion, half of the cheese sauce, and half of ham (Optional-see Note 1); REPEAT layers.
6.
BAKE, COVERED, 50 minutes; UNCOVER; BAKE until bubbly and potatoes are tender, 10-15 minutes longer.