01 -
Preheat your oven to 375°F (190°C).
02 -
Slice the peeled Vidalia onions into ¼-inch thick rounds, keeping the rings intact.
03 -
Sprinkle salt, garlic powder, and oregano over the onion rounds.
04 -
In an oven-safe dish, layer the seasoned onions with Italian blend cheese and cheddar cheese generously.
05 -
Dot the layered onions with unsalted butter pats.
06 -
Bake for about 25-30 minutes until golden brown and bubbly. Allow to cool slightly before serving.