Step 1

In a 6-quart slow cooker, add the brisket along with the seasoning packet

Step 2

Add the beer and enough water to just cover the beef

Step 3

Add in the cinnamon sticks, garlic, bay leaves, and chili or red pepper flakes, if using.Cover and cook on LOW for 6 hours

Step 4

Add the potatoes and carrots and cook on LOW for 2 more hours

Step 5

Add the cabbage and cook on LOW until the cabbage and corned beef are tender, about 2 hours longer.Transfer the corned beef from the slow cooker to a cutting board and rest for 15 minutes before slicing against the grain

Step 6

Serve with prepared potatoes, carrots, cabbage and mustard, if using.