Step 1

Preheat the oven to 350°F (180°C) and spray a 9x13 inch baking dish with non-stick cooking spray.

Step 2

Slice the sweet onions into ¼ inch rounds and separate the rings.

Step 3

Arrange the onion rings in the baking dish and sprinkle them with salt, garlic powder, and oregano.

Step 4

Place pats of butter evenly over the onions.

Step 5

Sprinkle the Italian blend and cheddar cheese over the onions, and top with parmesan cheese.

Step 6

Bake for 35-40 minutes or until the cheese is melted and bubbly and the onions are tender.

Step 7

Serve hot and enjoy!