Heat oven to 350 F and prepare a 9×13 dish with non-stick cooking spray.
Turning the onion sideways, slice into ¼ inch rounds and separate the rings.
Spread onion rings in baking dish and sprinkle with the salt, garlic powder, and oregano.
Slice the butter into approximately 8 pats and place evenly across dish.
Sprinkle the Italian blend and cheddar cheese over the onions and then add the parmesan on the very top.
Bake for 35-40 minutes or until cheese is starting to bubble and brown.
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