- 1 (4 pound) boneless beef chuck roast
- 2 (1 ounce) packages taco seasoning
- 1 onion, halved and sliced (optional)
- 1 teaspoon seasoned salt, or more to taste
- Place beef roast in crock of a slow cooker. Sprinkle taco seasoning over the beef; top with onion slices.
- Cook on Low 8 to 10 hours.
- Remove beef to a cutting board and shred with a pair of forks. Return beef to slow cooker and season with seasoned salt.