Season the beef chuck roast with salt and pepper.
In a skillet, sear the roast on all sides until browned.
Place the beef in a slow cooker.
Add beef broth and Italian seasoning to the slow cooker.
Top with sliced onions and bell peppers.
Cover and cook on low for 6-8 hours until beef is tender.
Remove the beef and shred it with two forks.
Return the shredded beef to the slow cooker and mix with juices.
Toast the hoagie rolls lightly.
Assemble the sandwiches: place shredded beef on the roll, top with provolone cheese and giardiniera.