Heat the oven to 350 degrees.
Drizzle the cabbage with olive oil and season with salt and pepper to taste. Add the cabbage to a well greased 9x13 baking dish.
Bake for 40 minutes.
While the cabbage is roasting, add the butter to a skillet over medium heat, and saute the onions until softened.
Stir in the garlic, and saute for 30 seconds.
Pour in the heavy whipping cream, Italian seasoning, fresh thyme and salt and pepper to taste. Simmer until the sauce thickens. Remove, and set aside.
Pour the sauce over the roasted cabbage, and bake another 30 minutes.
Remove, top with the cheese, and broil for 2-3 minutes.
Garnish with bacon pieces, parmesan cheese and chopped parsley if desired.