01 - Season the 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, about 2 to 3 minutes per side.
03 - Arrange halved baby potatoes, carrot pieces, and onion wedges in the slow cooker; add minced garlic on top.
04 - Place the seared beef chuck roast atop the layered vegetables in the slow cooker.
05 - Whisk together beef broth, tomato paste, and Worcestershire sauce; pour this mixture evenly over the roast and vegetables.
06 - Cover and cook on low heat for 8 hours, until beef is tender and vegetables are fully cooked.
07 - Remove the roast and vegetables carefully, keeping them warm while preparing the gravy.
08 - Skim any excess fat from the cooking liquid remaining in the slow cooker.
09 - In a small bowl, whisk cornstarch with cold water until smooth to form a slurry.
10 - Stir the cornstarch slurry into the cooking liquid and set the slow cooker to high; cook, stirring occasionally, for 5 to 10 minutes until thickened.
11 - Slice or shred the roast; serve with the cooked vegetables and spoon the thickened gravy over the top.