Begin the Transformation: Preheat your oven to 375º F. This is where the culinary magic starts.

Layering the Onions: In a 9x13-inch baking dish, artistically spread out the onion rings, keeping their rings and layers intact. Generously drizzle them with olive oil, and season with salt and pepper as if sprinkling them with love.

The Roasting Process: Place the baking dish in the oven, and allow the onions to roast for 15 minutes. Watch as they soften, transforming into something special.

Increasing the Heat: Remove the onions from the oven, and raise the temperature to a fiery 450º F.

Creating the Creamy Symphony: In a medium saucepan, over medium heat, delicately combine the heavy cream, wine, butter, garlic powder, and cayenne. Cook this mixture until the butter dances into a melt, and tiny bubbles waltz around the edges of the cream.

Uniting Flavors: Pour this beautiful mixture over the pre-roasted onions, and shower them with the grated Parmesan cheese. This is where the flavors begin to sing together.

The Final Roast: Cover the baking dish with aluminum foil and let it bake for another 20 minutes. Then, unveil the dish and cook for an additional 5-10 minutes, or until the onions are gorgeously caramelized, and the cheese is golden brown and tempting.

The Grand Presentation: Remove the dish from the oven and serve hot. This is your moment, a culinary triumph ready to be enjoyed.