01 - Pat the beef dry, then evenly season all sides with kosher salt and black pepper.
02 - Heat a large skillet over medium-high heat and sear the beef for 3 to 4 minutes on each side until deeply browned. Transfer the roast to the slow cooker.
03 - Arrange carrots, onion, garlic, celery, and baby potatoes (if using) around the beef in the slow cooker.
04 - In a separate bowl, whisk together beef broth, red wine (if using), tomato paste, Worcestershire sauce, dried thyme, dried rosemary, and bay leaves. Pour this mixture evenly over the beef and vegetables.
05 - Cover the slow cooker and cook on LOW for 8 hours or HIGH for 5 hours, until the beef is very tender and vegetables are thoroughly cooked.
06 - Transfer the beef and vegetables to a serving platter. Discard the bay leaves from the cooking liquid.
07 - In a small bowl, combine cornstarch with cold water to create a slurry. Stir this into the slow cooker liquid and cook on HIGH for 5 to 10 minutes until thickened.
08 - Slice or shred the beef and serve it alongside the vegetables, garnished with the thickened sauce.