In a small bowl, combine the broth, chipotle sauce, garlic, vinegar, lime juice, and spices.
Pour on top of the beef.
Cover and cook for 8 hours.
Remove the beef from the crockpot and place it on a cutting board.
Shred the beef with two forks.
Add back the shredded beef in the slow cooker and mix the rest of the sauce.
Serve on top of rice or use it for filling tacos.
Notes
For delicious crispy browned beef bits, briefly sear beef chuck roast in a pan before adding to the slow cooker.
Slow-cook beef barbacoa in a Dutch oven as well. Season and sear the beef on the stovetop before adding the rest of the ingredients. Coat the meat well in the sauce, cover, and slow cook in the oven at 300 degrees Fahrenheit for 2.5-3 hours or until the meat is fall apart tender.