01 - Pat the beef roast dry with paper towels. Rub all sides generously with salt, pepper, thyme, and rosemary, pressing the spices into the meat.
02 - Heat a large skillet over medium-high heat. Sear the roast on all sides until deeply browned, about 3–4 minutes per side. This step is optional but adds rich flavor.
03 - Arrange the potatoes, carrots, celery, and onion wedges in an even layer at the bottom of the slow cooker.
04 - Place the seasoned beef roast on top of the vegetables. Scatter the minced garlic over the meat and tuck the bay leaves into the liquid.
05 - Pour the beef broth and Worcestershire sauce evenly over the roast and vegetables.
06 - Cover and cook on low setting for 8 hours. The beef is done when it forks apart easily and vegetables are tender.
07 - Carefully transfer the roast and vegetables to a serving platter using tongs. Tent loosely with foil to keep warm while preparing the gravy.
08 - For thicker gravy, whisk cornstarch with water until smooth. Stir into the hot cooking liquid, cover, and cook on high for 10–15 minutes until thickened.
09 - Slice or shred the beef against the grain. Serve portions with vegetables and ladle gravy over the top. Garnish with fresh chopped parsley.