Toss zucchini with oil in a large bowl. Spread the zucchini on the preheated baking sheet in a single layer. Roast until beginning to brown, 5 to 7 minutes. Turn the zucchini and continue roasting until just tender, 7 to 9 minutes more. Return the zucchini to the bowl. Add pesto, salt and pepper; toss to coat.
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