Scalloped Potatoes
["3 Tbsp. margarine", "3 Tbsp. flour", "1 1/2 tsp. salt", "1/4 tsp. pepper", "3 c. milk", "9 medium potatoes", "2 Tbsp. minced onion"]
["Melt butter; stir in flour, salt and pepper, cooking 2 minutes. Slowly stir in milk and continually stir until thickened.", "Remove from heat.", "In 2-quart casserole, arrange sliced potatoes, onion, then sauce.", "Repeat layer.", "Cover and bake at 350\u00b0 for 1 hour. Uncover and bake until potatoes are tender.", "Makes for 10."]
["margarine", "flour", "salt", "pepper", "milk", "potatoes", "onion"]