Preheat your oven to 350 degrees f. and lightly spritz or rub to coat a 9x13 baking dish with avocado oil.
Place your chopped cabbage into a large bowl and season it generously with sea salt
and pepper. Using your hands, massage the cabbage for a few minutes, or until it starts to shrink. Set aside.
Heat a large skillet over medium heat and cook the ground meat, mincing it with a wooden spoon as it browns.
Once the meat is no longer pink, drain any excess grease, then stir in the onion and continue to cook for 4-5 minutes. Stir in all the seasonings, marinara sauce, and apple cider vinegar then bring the sauce to a boil. Once bubbling, remove from heat.
Allow all excess moisture to drain off the cabbage.
To assemble your casserole, add half of the meat mixture to the bottom of the prepared oven dish. Layer with half the cabbage and a sprinkle of cheese. Repeat layers with the remaining ingredients, finishing off with a layer of cheese on top.
Cover with foil and bake in your preheated oven for 45 minutes, then uncover and bake for an additional 15 minutes, or until the top is golden and the cabbage is tender.
Sprinkle with fresh thyme or parsley and enjoy!