Slow Cooker Shredded Beef for Tacos and Burritos

1 (4 pound) boneless beef chuck roast

2 (1 ounce) packages taco seasoning

1 onion, halved and sliced

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.