1️⃣ Preheat the oven: Preheat your oven to 350°F (175°C). Coat a 9×13-inch baking dish with non-stick cooking spray. 🔥

2️⃣ Prepare the onions: Clean and peel the Vidalia sweet onions. Slice them into rounds approximately ¼ inch in thickness and separate the slices into individual onion rings. 🧅🔪

3️⃣ Arrange the onion rings: Evenly distribute the onion rings across the bottom of the prepared baking dish. 🌟

4️⃣ Season the onions: Season the onion rings evenly with salt, garlic powder, and oregano. 🧂🌿

5️⃣ Add the butter: Cut the butter into roughly eight equal pats and distribute them evenly across the seasoned onion rings. 🧈

6️⃣ Add the cheeses: Sprinkle the Italian blend cheese and cheddar cheese evenly over the onion rings. Finish with a topping of shredded parmesan cheese. 🧀🧀🧀

7️⃣ Bake: Place the baking dish into the preheated oven and bake for 35-40 minutes, or until the cheese is browned and bubbly. ⏳🔥

8️⃣ Serve: For the best flavor, serve the dish promptly while warm. 🍽️