Easy Potato Au Gratin
["3 medium potatoes, peeled, cooked and sliced", "1/2 c. celery, chopped coarsely", "1 (10 3/4 oz.) can condensed Cheddar cheese soup", "1 Tbsp. prepared mustard"]
["Combine potatoes and celery in greased baking dish.", "Blend soup and mustard.", "Pour over vegetables.", "Sprinkle with bread crumbs.", "Bake at 375\u00b0 for 30 minutes or until hot and bubbly."]
["potatoes", "celery", "Cheddar cheese soup", "mustard"]