01 -
Heat your oven to 400°F and cover a baking tray with parchment paper.
02 -
Cut the onion into slices about 1/4-inch thick. Spread half the parmesan on the covered tray, then lay the onion rings over it in one layer.
03 -
Dust the onion rings with your seasonings, then give them a light spray of olive oil. Sprinkle the rest of the cheese over the top and bake for 15 to 20 minutes, or until they’re crispy and golden.