Mix the onion, garlic, beef broth, brown sugar, Worcestershire sauce, ground mustard, black pepper, thyme, and bay leaf in a bowl and pour over the brisket.
Cover and cook on low for 8 hours.
Add the cabbage, potatoes, and carrots to the slow cooker and cook for an additional 1-2 hours, until the vegetables are tender.
Serve and enjoy!
Interesting Facts
Corned beef is not native to Ireland. It was introduced by Irish immigrants to the United States in the 19th century.
Corned beef and cabbage is a traditional dish in many Irish-American households for St. Patrick’s Day.
The slow cooker is an ideal way to cook corned beef as it helps to tenderize the meat without drying it out.