Heat oven to 400°F. Line a large rimmed sheet pan with parchment.
Sprinkle Parmesan in a thin, even layer over the parchment.
Lay onion rings on top (close together, not overlapping).
Brush onions with olive oil. Season with salt, garlic powder, and paprika.
Bake until golden and crisp. Cool a few minutes, then break into chips.
