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Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 450 degrees. Wash and dry all produce. Cut potatoes into ½-inch-thick wedges. Trim and halve zucchini lengthwise; cut crosswise into ½-inch-thick half-moons. Mince chives. Zest and quarter lemon (for 4, zest 1 lemon; quarter both).