01 - Pat the beef roast dry with paper towels and season all sides generously with salt, pepper, thyme, and rosemary, pressing the spices into the meat to adhere.
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 builds flavor depth but can be skipped for convenience.
03 - Arrange the baby potatoes, carrots, celery, and onion wedges in an even layer at the bottom of the slow cooker insert.
04 - Place the seasoned beef roast on top of the vegetables. Sprinkle the minced garlic evenly over the roast and tuck the bay leaves into the liquid around the meat.
05 - Pour the beef broth and Worcestershire sauce over the roast and vegetables, ensuring the liquid is evenly distributed.
06 - Cover and cook on low setting for 8 hours, or until the beef pulls apart easily with a fork and vegetables are tender.
07 - Carefully transfer the roast and vegetables to a serving platter using tongs. Let the meat rest for a few minutes before slicing to retain juices.
08 - For a thicker gravy, whisk together cornstarch and water until smooth. Stir the slurry into the hot cooking liquid in the slow cooker. Cook on high for 10–15 minutes, stirring occasionally, until thickened to your desired consistency.
09 - Slice or shred the beef against the grain. Serve portions of meat and vegetables topped with gravy and a sprinkle of fresh parsley.