Vegetable Scallop
["1 medium onion", "1 pkg. scalloped potatoes", "1 (10 oz.) pkg. frozen mixed vegetables", "1/4 tsp. salt", "1/8 tsp. pepper", "1/4 tsp. celery seed", "1 to 1 1/4 c. boiling water", "1 c. grated or thinly sliced Velveeta cheese"]
["Slice onion thinly and saute in small quantity butter until soft."]
["onion", "potatoes", "frozen mixed vegetables", "salt", "pepper", "celery", "boiling water", "Velveeta cheese"]