Sear the Roast: Heat the oil in a skillet over high heat. Sear the chuck roast for 3–4 minutes per side, until nicely browned.
Transfer to Slow Cooker: Place the seared roast in a 6 or 7-quart slow cooker. Add the onion, carrots, potatoes (if using), beef stock, apple juice, tomato paste, garlic, parsley, salt, and pepper. Stir to combine.
Cook: Cover and cook on low for 7 to 8 hours, until the beef is very tender and easily pulls apart.
Shred & Adjust: Shred the beef directly in the slow cooker using two forks. Taste and adjust seasoning if necessary.
Serve & Enjoy: Serve hot over mashed potatoes (if you skipped the potatoes in the slow cooker), and garnish with fresh herbs if desired.
Notes
Swap part of the beef broth with red wine for a richer, deeper flavor.
Store leftovers in an airtight container in the fridge for up to 3 days.
Delicious served with mashed potatoes, roasted veggies, or warm dinner rolls.