01 - Pat beef dry and season all sides evenly with kosher salt and black pepper.
02 - Heat a large skillet over medium-high heat and sear roast for 3 to 4 minutes per side until browned. Transfer to slow cooker.
03 - Arrange carrots, onion, garlic, celery, and baby potatoes (if using) around beef in the slow cooker.
04 - Whisk together beef broth, red wine (if using), tomato paste, Worcestershire sauce, thyme, rosemary, and bay leaves; pour over beef and vegetables.
05 - Cover and cook on LOW for 8 hours or HIGH for 5 hours until beef is tender and vegetables are cooked through.
06 - Remove beef and vegetables to a serving platter and discard bay leaves.
07 - Mix cornstarch and cold water in a small bowl; stir into slow cooker and cook on HIGH for 5 to 10 minutes until sauce thickens.
08 - Slice or shred beef and serve alongside vegetables with sauce.