Peel the carrots

Cut the carrots into bite-sized pieces

Cut the potatoes into quarters

Coarsely chop the onion

Cut the cabbage into quarters

Spray the slow cooker with cooking spray

Put the carrots, potatoes, and onion into the bottom of the slow cooker

Pour in the water

Put the brisket on top of the vegetables

Pour the beer over the brisket

Sprinkle the spices from the corned beef packet

Cover the slow cooker pot

Set the cooker on High

Cook for 7 hours

An hour before serving, add the cabbage

Cook for 1 more hour