In a 6 qt or larger crockpot place the vegetables and broth.
Top with the chuck roast. Season the roast with the pepper and garlic salt.
Cook, covered, on low 6-8 hours or until meat is tender.
Remove meat and vegetables. In a small bowl stir together cold water and cornstarch to create a slurry. Whisk it into the remaining juices in the crockpot to thicken. This creates a wonderful gravy/au jus for the pot roast.