Creating Slow Cooker Corned Beef & Cabbage is simple when you follow these clear steps:

1. Prepare the Ingredients: Rinse the corned beef brisket under cold water to remove excess salt and packaging brine.
2. Layer the Vegetables: Place the potatoes and carrots in the bottom of the slow cooker.
3. Add the Onion: Scatter the quartered onion on top of the vegetables.
4. Place the Corned Beef: Lay the corned beef brisket over the vegetables with the fat side facing up.
5. Mix the Liquid: In a separate bowl, combine the beef broth, apple cider vinegar, and Dijon mustard. Pour this mixture over the meat and vegetables.
6. Add the Cabbage: Arrange the cabbage wedges on top of the corned beef.
7. Season: Sprinkle the spice packet included with your corned beef over the top, and season with additional salt and pepper if desired.
8. Cook: Cover and set your slow cooker on low for 8 to 10 hours, or until the corned beef is tender.
9. Check for Doneness: For best results, ensure the internal temperature of the brisket reaches at least 190°F (88°C) for maximum tenderness.
10. Serve: Once cooked, slice the corned beef against the grain and serve it with the vegetables, garnished with fresh parsley if desired.