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Slice the onions no more than ¼ inch thick.
Preheat the oven to 400°F.
Lay down parchment paper on a cookie sheet.
Pour grated Parmesan cheese over the parchment paper and spread it out.
Place the sliced onions over the cheese.
Lightly brush olive oil over the top of the onions.
Season the onions with your chosen seasoning.
Bake in the oven for 18 to 20 minutes or until done (may take longer).
Let cool for 20 minutes to set up.