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Preheat your oven to 375°F (190°C).
Place the onion rings in a single layer in a baking dish. Drizzle with olive oil and season with salt and pepper. Toss to coat the onions evenly with the oil and seasoning.
Roast the onions in the preheated oven for 25-30 minutes, or until they begin to soften and caramelize.
While the onions are roasting, combine heavy cream, grated Parmesan cheese, minced garlic, and thyme leaves in a small saucepan. Heat over medium-low heat, stirring occasionally, until the cheese is melted and the sauce is smooth.
Pour the cream sauce over the roasted onions. Return the baking dish to the oven and bake for an additional 15-20 minutes, or until the sauce is bubbly and the onions are tender.
Garnish with fresh thyme sprigs, if desired, for added flavor and presentation.
Serve warm and enjoy the creamy, cheesy goodness of this roasted onion dish!