Potato - Au Gratin Potatoes

2 pounds potatoes, peeled and cut into 1/4 inch slices
1/4 cup margarine
3 tablespoons flour
1 1/4 cups milk
1 cup grated cheese (4 ounces) sharp cheddar or American
3/4 teaspoon salt
1/2 teaspoon pepper
4 cloves minced garlic
6 green onions thinly sliced
1/3 cup Parmesan cheese

Heat oven to 350. Place potato slices and garlic in large saucepan and cover with water. Bring to a boil and cook until just tender, about 8 minutes. Drain and allow to cool slightly.

While potatoes are cooking, melt butter over medium heat. Stir in flour and whisk until a thick paste forms. Gradually add milk and cook, stirring constantly until thickened. Add cheese and stir until melted. Stir in salt and pepper.

Place about 2/3 of the cooked potatoes in a 7x11 Pyrex dish which has been sprayed with nonstick cooking spray. Spoon on half of the cheese sauce and half of the green onions. Top with remaining potatoes, sauce and onions. Sprinkle with Parmesan cheese.

Bake uncovered until lightly browned and mixture is bubbly -about 40 to 45 minutes.