Preheat your oven to 350°F (175°C). Cut the cabbage into 6-8 thick wedges.
Heat avocado oil in a large, oven-safe skillet over medium-high heat. Sear the cabbage wedges for 3-4 minutes per side, until golden-brown. Season with salt.
Transfer the seared cabbage wedges to a baking dish.
In the same skillet, melt the butter. Sauté the chopped onion until soft. Add the minced garlic and cook for one minute. Pour in the chicken broth, scraping the bottom of the pan. Let it simmer for a minute.
Stir in the heavy cream, Parmesan cheese, oregano, and thyme. Whisk until the sauce is smooth and creamy. Season with salt and pepper.
Pour the sauce over the cabbage. Bake for 40 minutes, until the cabbage is very tender. For extra color, broil on high for 2-3 minutes, watching carefully.
Garnish with fresh parsley and extra Parmesan before serving.
