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Adjust racks to top and middle positions and place a foil-lined baking sheet on middle rack. (For 4 servings, adjust to top, middle, and bottom positions with 2 foil-lined sheets on middle and bottom racks.) Preheat oven to 425 degrees. Wash and dry all produce.
Trim and thinly slice scallions, separating whites from greens. Trim and halve Brussels sprouts lengthwise.