01 - In a small bowl, combine ground cumin, dried oregano, smoked paprika, sea salt, black pepper, and cinnamon. Stir until evenly mixed.
02 - Place the beef chuck chunks into the slow cooker. Sprinkle the spice blend over the beef and toss to coat all pieces evenly.
03 - Add the chopped onion, minced garlic, chopped chipotle peppers, and jalapeño to the slow cooker, distributing them around and over the beef.
04 - In a separate bowl, whisk together the fresh lime juice, apple cider vinegar, beef broth, and tomato paste until smooth. Pour the mixture over the beef and vegetables in the slow cooker.
05 - Tuck the bay leaves into the liquid. Cover the slow cooker and cook on LOW for 8 hours, or until the beef is extremely tender and shreds apart effortlessly.
06 - Remove and discard the bay leaves. Using two forks, shred the beef directly in the slow cooker, mixing it thoroughly with the accumulated juices.
07 - Serve hot in tacos, burritos, or over rice bowls, garnished with your favorite toppings such as cilantro, diced onion, and lime wedges.