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Preheat the oven to 350*
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Spray a 9×13 baking dish with nonstick spray
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Slice the onion into ¼ inch rounds
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Separate the onion rings
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Spread the rings into the baking dish
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Sprinkle the onion rings with garlic powder, salt and Oregano
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Slice the butter into 8 slices of butter
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Place the butter evenly across the top of the onion and spices
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Sprinkle the Italian blend Cheese and the Cheddar Cheese over the entire top
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Sprinkle with the Parmesan Cheese at the end
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Place in the oven and bake for 35 to 40 minutes, or until the cheese begins to bubble and brown
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Serve immediately