3-4 sweet onions, we used Vidalia
    4 tablespoons butter
    1 teaspoon salt, or to taste
    1 teaspoon garlic powder
    1/2 teaspoon oregano
    1 cup shredded Italian blend cheese
    1 cup shredded cheddar cheese
    ½ cup shredded parmesan cheesePREPARATION
    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.