Buffet Cheese-Scalloped Carrots
["12 sliced carrots", "1 small onion, chopped", "1 tsp. salt", "2 c. milk", "1/4 tsp. celery seed", "3 c. buttered bread crumbs", "1/4 c. butter", "1/4 c. flour", "1/4 tsp. dry mustard", "1/8 tsp. pepper", "1/2 lb. sharp American cheese"]
["Preheat oven to 350\u00b0.", "Cook carrots and drain."]
["carrots", "onion", "salt", "milk", "celery", "buttered bread crumbs", "butter", "flour", "dry mustard", "pepper", "American cheese"]