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Adjust rack to top position (top and bottom positions for 4 servings) and preheat oven to 425 degrees. Wash and dry produce.
Dice potatoes into ½-inch pieces. Trim, peel, and cut carrots on a diagonal into ½-inch-thick pieces. Strip half the thyme leaves from stems (all for 4); roughly chop leaves. Peel and mince or grate garlic. Trim and thinly slice scallions, separating whites from greens.