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Layer-and-bake dishes offer ways to turn leftovers into something luscious -- and they're ideal mediums for healthful ingredients. In this dish, a little Gruyere cheese provides a decadent texture, while sweet potatoes, leeks, and tangy grated apple make the dish especially moist, so you can use less fat.

• 1 pound Yukon gold potatoes, thinly sliced
• 12 ounces sweet potatoes, thinly sliced
• 1 green apple (6 ounces), cored and grated
• 3 leeks, white and pale-green parts only, halved lengthwise, sliced 1/8 inch thick, and rinsed well
• 1 tablespoon extra-virgin olive oil
• Coarse salt and freshly ground pepper
• 2 ounces grated Gruyere cheese (1 cup)

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