01 -
Heat your oven to 400°F. Using either a mandolin slicer or a really sharp knife, slice your onions super thin - you want them almost paper-thin for maximum crispiness. If you're using a mandolin, the thinnest setting works best.
02 -
Line a baking sheet with parchment paper, then evenly scatter the shredded Parmesan across the entire surface, creating a nice even blanket of cheese that covers the whole pan.
03 -
Arrange your thinly sliced onion rings over the cheese in a single layer, trying not to overlap them too much so they crisp up evenly.
04 -
Lightly brush the olive oil over the top of all the onion slices. Then sprinkle the sea salt, garlic powder, smoked paprika, and black pepper evenly across everything.
05 -
Pop the baking sheet into your preheated oven and bake for about 18 to 20 minutes, keeping an eye on it. You'll know it's done when the cheese has turned golden brown and gotten nice and crispy around the edges.
06 -
Take the pan out of the oven and let everything cool down for a couple minutes - this helps the chips firm up even more. Once cooled slightly, break or cut the sheet into individual chip-sized pieces and enjoy!