Au Gratin Potatoes
["2 c. white sauce", "dash of pepper", "1 c. shredded cheese", "1/2 c. Parmesan cheese", "5 c. cooked sliced potatoes", "1/4 c. dry bread crumbs", "1 Tbsp. melted margarine"]
["Add pepper and cheeses to hot white sauce; stir until cheese melts. Combine sauce and potatoes and pour into 2-quart casserole. Toss crumbs with margarine and sprinkle over potatoes. Bake at 350\u00b0", "for 35 minutes.", "Garnish with chopped olives."]
["white sauce", "pepper", "shredded cheese", "Parmesan cheese", "potatoes", "bread crumbs", "margarine"]