Make the quick pickled onions by combining the sliced red onion, grated garlic, lime zest and juice, red wine vinegar, maple syrup (if using), cilantro and a pinch of salt. Let sit for at least 15 minutes.
Preheat oven to 400°F. Toss the cauliflower florets and chickpeas with the garlic powder, coriander, onion powder, thyme and a drizzle of avocado oil. Roast for 20-25 minutes, until cauliflower is tender and chickpeas are crispy.
Make the chipotle yogurt sauce by blending the chipotle peppers, plant-based yogurt, vegan mayo, lime juice and zest, maple syrup, grated garlic and cilantro. Add water as needed to reach desired consistency.
To assemble, spread the chipotle yogurt sauce on the pitas, top with the roasted cauliflower and chickpeas, quick pickled onions and lettuce.
