01 - Season the beef chuck roast evenly with kosher salt, black pepper, dried thyme, and dried rosemary on all sides.
02 - Heat a large skillet over medium-high heat and sear the roast on all sides until browned, approximately 2 to 3 minutes per side.
03 - Arrange halved baby potatoes, peeled and cut carrots, and onion wedges in the base of the slow cooker. Add minced garlic on top.
04 - Position the seared beef roast on top of the prepared vegetables in the slow cooker.
05 - In a bowl, 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 the beef is tender and the vegetables are cooked through.
07 - Carefully transfer the beef and vegetables to a serving dish, keeping them warm.
08 - Skim excess fat from the liquid remaining in the slow cooker to prepare for the gravy.
09 - Whisk cornstarch and cold water together in a small bowl until smooth to create a slurry.
10 - Stir the cornstarch slurry into the slow cooker liquid. Set slow cooker to high and cook, stirring occasionally, until the gravy thickens, about 5 to 10 minutes.
11 - Slice or shred the beef roast and serve with the cooked vegetables. Spoon the thickened gravy over the top.