Place the chuck roast into the slow cooker.
Add the soy sauce, garlic powder, onion powder, rosemary, thyme, peppercorns, and bay leaf. Pour the water over everything.
Cover and cook on low for 6 to 8 hours until the roast is completely tender and falling apart.
Remove the roast and shred with two forks.
Toast the hoagie rolls if desired. Spread generously with room temperature cream cheese. Pile on the shredded beef and top with thinly sliced Vidalia onion.
Strain the cooking liquid and ladle into small bowls for dipping.