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Adjust racks to top and middle positions and preheat oven to 425 degrees. Wash and dry all produce.
Trim Brussels sprouts; halve or quarter lengthwise depending on size. Peel and dice sweet potato into ½-inch pieces. Halve and core apple; thinly slice one half (whole apple for 4 servings). Peel and mince or grate garlic. Halve ciabatta lengthwise. Remove and discard any large stems from kale.