01 - Season the beef chuck roast thoroughly on all sides with kosher salt, black pepper, dried thyme, and dried rosemary.
02 - Heat a large skillet over medium-high heat and sear the roast on all sides until evenly browned, approximately 2 to 3 minutes each side.
03 - Place halved baby potatoes, carrot pieces, and onion wedges in the slow cooker base. Add minced garlic over the vegetables.
04 - Place the seared roast atop the bed of vegetables in the slow cooker.
05 - In a mixing bowl, whisk together beef broth, tomato paste, and Worcestershire sauce; pour evenly over the roast and vegetables.
06 - Cover and cook on the low setting for 8 hours until beef is fork-tender and vegetables are fully cooked.
07 - Carefully remove the roast and vegetables from the slow cooker and keep warm.
08 - Skim excess fat from the cooking liquid remaining in the slow cooker.
09 - In a small bowl, combine cornstarch with cold water and whisk until smooth to form a slurry.
10 - Stir the cornstarch slurry into the slow cooker liquids, increase heat to high, and cook with occasional stirring until the gravy thickens, about 5 to 10 minutes.
11 - Slice or shred the beef roast, plate with cooked vegetables, and generously spoon the thickened gravy over all.