01 - Arrange the sliced onion and minced garlic evenly across the bottom of the slow cooker insert.
02 - Rub the chuck roast thoroughly with salt, black pepper, dried thyme, and dried rosemary. Place the seasoned roast directly on top of the onion layer.
03 - Pour the beef broth, soy sauce, and Worcestershire sauce over the beef and onions, ensuring the roast is partially submerged.
04 - Cover the slow cooker and cook on low heat for 8 hours until the beef is fork-tender and easily shreds.
05 - Transfer the cooked beef to a cutting board. Using two forks, shred the meat into bite-sized pieces. Return the shredded beef to the crockpot and stir well to coat with the accumulated juices.
06 - Set your oven to broil. Slice the hoagie rolls in half horizontally and pile the shredded beef onto the bottom halves. Top with cheese slices if desired.
07 - Arrange the assembled sandwiches on a baking sheet. Broil for 2–3 minutes until the cheese is bubbly and melted, watching carefully to prevent burning.
08 - Transfer the sandwiches to serving plates. Ladle the cooking liquid from the crockpot into small bowls and serve alongside for dipping.