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