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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 produce.
Trim and halve zucchini lengthwise; slice crosswise into ½-inch-thick half-moons. Peel garlic and place in the center of a small piece of foil; drizzle with olive oil and season with salt and pepper. Cinch into a packet. Halve tomatoes. Mince chives.