Preheat the oven to 400°F and line a 12×17-inch rimmed baking sheet with parchment paper.
Evenly sprinkle a thin layer of Parmesan cheese across the baking sheet.
Arrange the onion rings in a single layer, keeping them close but not overlapping.
Lightly brush the tops with olive oil and season with salt, garlic powder, and paprika.
Bake for about 20 minutes, or until golden brown and crispy.
Let cool for 10 minutes before breaking apart.
Serve with tzatziki and enjoy!
