Start by blotting the chuck roast dry with paper towels, then coat all sides liberally with salt and pepper.
Arrange the onion slices, chopped carrots, and potato pieces across the bottom of your slow cooker insert to form a base.
Position the seasoned roast directly over the vegetable layer.
In a mixing bowl, combine the beef broth, crushed tomatoes or tomato juice, apple cider vinegar, brown sugar, Worcestershire sauce, soy sauce, minced garlic, dried thyme, and bay leaves. Stir thoroughly until the mixture is well blended.
Carefully pour the prepared liquid over the meat and vegetables, ensuring an even distribution.
Secure the lid on the slow cooker and cook on the Low setting for 8 to 9 hours, or until the meat easily separates with a fork and the vegetables are tender.
Once done, discard the bay leaves. Carve or shred the roast and serve alongside the cooked vegetables, spooning the savory broth over the top before serving.