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Heat the oven to 425°F. Combine the eggplant, zucchini, squash, tomatoes, onion, garlic, salt, and thyme in a large roasting pan. Drizzle with the oil and toss to combine.
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Transfer to the oven and roast, stirring occasionally, until the vegetables are lightly browned and tender and some water has released from the tomatoes to create a sauce, 30 to 40 minutes.
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Add the chickpeas, stir, and return to the oven until the beans heat through, 5 to 10 minutes. Add the basil and stir. Taste and adjust the seasoning and serve hot, warm, or at room temperature.