01 - Season the beef chuck roast evenly with salt and black pepper on all sides.
02 - Heat 1 tbsp oil in a large skillet over medium-high heat and sear the roast until browned on all sides, approximately 4-5 minutes per side.
03 - Layer carrots, potatoes, celery, onion, and garlic in the base of the slow cooker.
04 - Place the seared or raw seasoned roast on top of the vegetables in the slow cooker.
05 - Pour beef broth and Worcestershire sauce over the meat and vegetables. Sprinkle dried thyme, rosemary, and add bay leaves.
06 - Cover the slow cooker and cook on low heat for 8 hours, or until the meat is tender and easily shredded with a fork.
07 - Transfer the cooked roast and vegetables to a serving platter. Discard bay leaves. Strain the cooking liquid into a saucepan.
08 - Whisk cornstarch or flour with cold water until smooth. Stir this mixture into the saucepan and bring to a simmer over medium heat, whisking continuously until the gravy thickens, about 3–5 minutes.
09 - Slice or shred the roast and serve it alongside the vegetables, drizzled with the savory gravy.