Given the task definition and input, reply with output. In this task, you have to generate the title of the recipe given its required ingredients and directions.

ingredients: '4 cups thinly sliced potatoes (about 4 to 5 medium)', '12 lb velveeta processed cheese, cut up', '12 cup chopped onion', '1 teaspoon dry mustard', '14 teaspoon pepper',<sep> directions: 'COOK potatoes in boiling water 18 minutes or until barely tender;.', 'drain.', 'TOSS potatoes and remaining ingredients in 2-quart casserole; cover.', 'BAKE at 350F for 20 to 22 minutes or until potatoes are tender.', 'Stir before serving.', 'VARIATION: Add 1 cup chopped ham with remaining ingredients.'
Potatoes Au Gratin