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Adjust racks to middle and top positions and preheat oven to 450 degrees. Wash and dry all produce. Halve sweet potatoes lengthwise; cut crosswise into ΒΌ-inch-thick half-moons. Toss on a baking sheet with a drizzle of olive oil and a big pinch of salt and pepper. Roast on top rack, flipping halfway through, until tender, 20-25 minutes.