01 - Season beef chuck roast evenly on all sides with kosher salt, black pepper, dried thyme, and dried rosemary.
02 - Heat a large skillet over medium-high heat and brown the roast on all sides, approximately 2 to 3 minutes per side.
03 - Place halved baby potatoes, carrot pieces, and onion wedges in the base of the slow cooker, then add minced garlic evenly over the vegetables.
04 - Position the seared beef chuck roast on top of the arranged vegetables in the slow cooker.
05 - Whisk beef broth, tomato paste, and Worcestershire sauce in a bowl, then pour this mixture uniformly over the roast and vegetables.
06 - Cover the slow cooker and cook on low heat for 8 hours, or until the beef is fork-tender and vegetables are fully cooked.
07 - Carefully remove the cooked roast and vegetables from the slow cooker and keep warm while preparing the gravy.
08 - Skim off excess fat from the liquid remaining in the slow cooker to ensure a clearer gravy.
09 - In a small bowl, whisk cornstarch with cold water until smooth, creating a slurry to thicken the gravy.
10 - Stir the slurry into the slow cooker liquids, set to high heat, and cook while stirring occasionally until the gravy thickens, about 5 to 10 minutes.
11 - Slice or shred the beef, plate with the cooked vegetables, and spoon the thickened gravy over the top before serving.