Begin by placing the 2-pound beef roast at the bottom of the slow cooker. Next, slice the medium onion and layer the pieces on top of the beef, allowing their sweetness to seep into the meat as it cooks.

In a separate bowl, mix together 2 cups of beef broth, 2 tablespoons of Worcestershire sauce, and 1 tablespoon of soy sauce. Carefully pour this aromatic mixture over the beef and onions in the slow cooker.

Sprinkle 1 teaspoon each of garlic powder, onion powder, dried thyme, black pepper, and ½ teaspoon of salt over the beef and onions. Give the slow cooker a gentle shake to distribute the spices evenly.

Cover the slow cooker and set it to low heat for 8 hours or high heat for 4 hours.

Once the cooking time is up, carefully transfer the beef to a cutting board to rest. In the slow cooker, mix 2 tablespoons of cornstarch with 2 tablespoons of cold water to create a slurry. Stir this mixture into the cooking liquid and cook on high for an additional 5 minutes.

Slice the tender beef roast into thick pieces, then generously heap them onto toasted white or Texas bread. Drizzle the thickened sauce over the beef.