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Adjust racks to middle and top positions and preheat oven to 450 degrees. Wash and dry all produce. Slice sweet potatoes into ¼-inch-thick rounds. Toss on a baking sheet with a drizzle of olive oil, 1 tsp harissa powder (2 tsp for 4 servings; you’ll use more later), and a pinch of salt and pepper. Roast on middle rack, flipping halfway through, until tender, 18-20 minutes.