12 med. carrots, pared & sliced
1 sm. onion
1/4 c. butter
1/4 c. flour
1 tsp. salt
1/4 tsp. dry mustard
2 c. milk
1/8 tsp. pepper
1/4 tsp. celery salt
1/2 lb. American cheese slices

Cook carrots. Drain. Cook onion in butter, stir in flour, salt, mustard and milk. Cook and stir until smooth. Add pepper and celery salt. Layer carrots and cheese, ending with carrots. Pour sauce over all. Bake uncovered 25-30 minutes in 350 degree oven.