Preheat the oven to 375°F. Layer the zucchini, yellow squash, onion and tomatoes in a baking dish. Season with the garlic, Italian seasoning, salt, black pepper and, if desired, a pinch of crushed red pepper flakes. Cover and bake for 35–40 minutes.
Remove from the oven and lightly spread my plant-based ricotta over the top of the vegetables. If desired, sprinkle with whole-grain or gluten-free breadcrumbs. Return to the oven, uncovered, for 10–15 minutes or until the vegetables are tender and lightly golden. Sprinkle with the fresh herbs before serving.