Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
For each onion ring, add about 1 tablespoon of shredded parmesan directly onto the parchment paper to form a cheese mold.
Place an onion slice on top of the cheese mold and add another tablespoon of shredded parmesan over the onion ring.
Gently press down with the back of a spoon to flatten slightly and season the tops with salt, garlic powder, and paprika.
Bake in the preheated oven for about 15–20 minutes or until the cheese is golden brown and crisp around the edges.
Allow the onion rings to cool for about 10–15 minutes before serving.