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Adjust racks to top and middle positions and preheat oven to 450 degrees. Wash and dry all produce. Dice sweet potato into ½-inch pieces. Toss on a baking sheet with a drizzle of olive oil, ¼ tsp cumin (½ tsp for 4 servings; be sure to measure), salt, and pepper. Roast on middle rack until lightly browned, 20-25 minutes.