Preheat your oven to 325°F.
Rinse the corned beef brisket under cold water to remove excess salt. Place it in a large roasting pan, fat side up.
In a mixing bowl, combine the beef broth, minced garlic, brown sugar, apple cider vinegar, black pepper, and dried thyme. Pour this mixture over the corned beef.
Arrange the quartered onion, carrots, and potatoes around the brisket in the roasting pan.
Cover the pan tightly with aluminum foil and place it in the preheated oven. Bake for 2.5 to 3 hours, or until the meat is tender.
After the cooking time, remove the foil and add the cabbage wedges to the pan. Cover again and bake for an additional 30 minutes.
Once done, remove the pan from the oven and let the corned beef rest for about 10 minutes before slicing against the grain.