01 - Arrange sliced onions and minced garlic evenly across the bottom of the slow cooker insert.
02 - Rub the chuck roast thoroughly with salt, pepper, thyme, and rosemary. Place the seasoned roast directly on top of the onion layer.
03 - Pour beef broth, soy sauce, and Worcestershire sauce over the roast and onions, ensuring the beef is partially submerged.
04 - Cover with the lid and cook on low setting for 8 hours until the beef becomes fork-tender and easily shreds apart.
05 - Transfer the cooked beef to a cutting board and shred using two forks. Return the shredded meat to the slow cooker and stir well to absorb the au jus.
06 - Preheat the oven broiler. Split the hoagie rolls open, fill generously with shredded beef, and top each sandwich with a cheese slice.
07 - Arrange sandwiches on a baking sheet and broil for 2 to 3 minutes until the cheese is melted and bubbly.
08 - Present sandwiches alongside small bowls filled with au jus from the slow cooker for dipping.