Scalloped Potatoes - cooking recipe

Ingredients

1/3 c. butter or margarine
1/2 c. minced onion
1/3 c. flour
3 c. milk
2 1/2 c. (10 oz.) grated Cheddar cheese
1 Tbsp. salt
1/4 tsp. dry mustard
1/8 tsp. pepper
10 c. thinly sliced potatoes (about 4 lb.)
1/4 tsp. paprika

Preparation

In a medium saucepan, melt butter or margarine.
Add onion. Saute until soft, 2 to 3 minutes.
Stir in flour; cook over low heat for one minute.
Gradually add milk; stir constantly.
Cook over medium heat until slightly thick and begins to boil.
Add 1 cup cheese, salt, mustard and pepper.
Remove from heat; stir until cheese is melted.
Arrange half of potatoes in 13 x 9-inch greased baking dish.
Pour half sauce over potatoes.
Arrange remaining potatoes in pan; pour on remaining sauce.
Cover with foil.
Bake for 1 hour or until potatoes are fork-tender. Uncover; sprinkle with remaining cheese and sprinkle paprika. Return to oven until cheese is melted.