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Adjust oven rack to upper position and preheat oven to 450 degrees. Wash and dry all produce. Mince or grate garlic until you have ½ tsp (you’ll have a clove left over). Halve, peel, and thinly slice onion. Cut zucchini into 3-inchlong sections, then halve each piece lengthwise. Cut halves into thin wedges.