Cut the beef into 3-4 chunks.
In a small bowl, combine chili powder, cumin, garlic, salt, pepper, and paprika. Rub seasoning on all sides of the beef chunks. Place the seasoned beef into the slow cooker. In a small bowl, combine beef broth, adobo sauce, and minced chipotles. Pour the mixture over the beef.
Cook on low for 8-9 hours.
Shred the beef and remove any excess fat.
Place beef back into the liquid and continue to slow cook for another hour (recommended) if you have time. Serve as desired. Store leftovers in an airtight container for up to 5 days.