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Adjust rack to middle position and preheat oven to 450 degrees. Wash and dry produce.
Trim and halve zucchini lengthwise; cut crosswise into ½-inch-thick half-moons. Trim, peel, and cut carrots on a diagonal into ½-inch-thick pieces. Halve mandarin. Trim and thinly slice scallions, separating whites from greens.