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Preheat the oven to 400°F with the rack in the middle.
Scatter the shredded Parmesan evenly over parchment paper.
Slice the onions into ¼-inch thick slices, keeping them intact and touching but not overlapping.
Brush the onion slices with olive oil and season with salt, garlic powder, paprika, and black pepper.
Bake in the oven for 18 minutes or until desired crispiness is achieved.