Preheat your air fryer or oven to 400°F (200°C).
Slice the zucchini into thick rounds, about ½ inch thick. Using a small round cutter, apple corer, or bottle cap, remove the centers to create rings. Reserve the centers for the dip.
Place the zucchini rings in a large bowl. Drizzle with olive oil and toss to coat.
Add the cornstarch, breadcrumbs, parmesan, garlic powder, onion powder, paprika, oregano, salt, and black pepper. Toss until the zucchini rings are evenly coated.
Arrange the zucchini rings in a single layer in the air fryer basket or on a parchment-lined baking sheet.
Air fry or bake for 20-25 minutes, flipping halfway through cooking, until golden brown and crispy.
While the zucchini rings cook, heat 1 tablespoon olive oil in a skillet over medium heat. Add the reserved zucchini centers and a pinch of salt. Cook for 3-5 minutes until softened.
Transfer the cooked zucchini centers to a blender or food processor. Add the lemon juice, yogurt, tahini, garlic powder, onion powder, paprika, oregano, salt, and black pepper.
Blend until smooth and creamy. Taste and adjust the seasoning if needed.
Serve the crispy zucchini rings warm with the creamy lemon zucchini dip. Garnish with extra parmesan, fresh parsley, or lemon wedges if desired.