Preheat your Cooking System to a high stovetop setting. If you do not have a cooking system, this step will need to be done in a skillet. Add the olive oil and pieces of chuck roast. Sear the meat until some pieces are browned.
Add the balance of ingredients and stir gently to combine.
Cover and dial your cooking system to Slow Cook Low for 6-8 hours, Slow Cook High for 3-4 hours, or until the beef is tender and falls apart easily when shredded with a fork. If you do not have a cooking system, use your standard crock pot on the Low or High setting of your choice.
Using two forks, shred the beef into bite-sized pieces inside of the slow cooker. Toss the beef with the juices, then cover and let the barbacoa beef soak up the juices for an extra 10 minutes.
Remove the bay leaves. Use a pair of tongs or a slotted spoon to serve the barbacoa beef.