Combine beef broth, salt, pepper, Italian seasoning, diced onion, parsley, garlic powder, Bay leaf, and Italian salad dressing mix.
Put the roast in the Instant Pot.
Pour mixture over top of the roast.
Add chopped pepperoncini and liquid over roast
Cover, seal and cook on high for 1 hour.
When done allow to natural release for 15 minutes. Then release any remaining pressure and remove beef from the Instant Pot.
Shred meat with two forks
Serve topped with mozzarella cheese and extra peppers if desired.