Definition: In this task, you have to generate the title of the recipe given its required ingredients and directions.
Input: ingredients:  '1 teaspoon butter', 'nonstick cooking spray', '1 medium onion, thinly sliced', '2 tablespoons flour', '2 cups nonfat milk', '2 lbs potatoes (blue or golden, not russet)', '8 ounces shredded nonfat cheddar cheese', '14 teaspoon black pepper',<sep> directions: 'Preheat oven to 375 degrees.', 'Coat 2-quart dish with spray.', 'Wash, dry and then use a mandolin to thinly slice the potatoes.', 'No need to peel the potatoes.', 'Melt butter in large pan or pot.', 'Add onion.', 'Spray with nonstick spray.', 'Cook, stirring occasionally, until onion is completely softened, about 5 minutes.', 'Stir in flour, then slowly add milk.', 'Add potatoes.', 'Stir to mix.', 'Bring to a boil.', 'Stir in 6 oz.', 'of the cheese and papper.', 'Pour into prepared dish, spreading them out evenly.', 'Bake for 1 hour uncovered.', 'After 1 hour, cover with lid or foil and bake another 20 minutes.', 'Remove from oven.', 'Sprinkle with rest of cheese.', 'Recover with lid or foil until cheese has melted.', 'Serve.'

Mostly Nonfat Au Gratin Potatoes