Step 1

Using non-stick cooking spray, prepare a 9x13 baking dish.

Step 2

Heat over to 350

Step 3

Slice the Vidalia onions in 1/4 to 1/2 inch slices and separate the rings.

Step 4

Lay the rings in the prepared baking dish

Step 5

Sprinkle the onion rings with garlic salt (about 1 tsp), pepper (about 1/2 tsp).

Step 6

Cut the butter into pats and place around the dish on top of the onions.

Step 7

Spread the cheddar and mozzarella cheeses on top of the onions and then top with the grated parmesan cheese.

Step 8

Bake at 350 uncovered for 30 minutes or until bubbly and the cheese has started to brown (browned cheese bits is one of the best parts!)

Step 9

Remove from the oven, allow to cool for a few minutes, garnish with some fresh herbs (oregano, chives, thyme all work well)  and then serve.