1 c. skim milk
2 tsp. cornstarch
2 lg. potatoes
1/4 c. chopped onion
2 tbsp. Parmesan

SAUCE:

In a small saucepan, stir together milk, cornstarch, 1/4 teaspoon salt, and 1/4 teaspoon pepper. Cook and stir over medium heat until thickened and bubbly. Remove from the heat. Set aside.

Lightly spray the sides of a 1 1/2 quart casserole with non-stick spray coating. Peel potatoes and slice very thin. Layer half the potatoes and half the onions into the casserole. Repeat layers. Pour sauce over mixture. Sprinkle with Parmesan cheese. Bake, covered, in 350 degree oven for 40 minutes. Uncover, bake 10 to 15 minutes more or until potatoes are tender. Serves 4.