1. Add oil to instant pot and set to saute. Add beef roast and sear on both sides until browned. Carefully remove meat from pot and set aside. 2. Add onions and continue to saute until tender. 3. Add broth and bay leaf. Use wooden spoon to scrape up brown bits of onions and beef from bottom of pan. Return meat to pot and add seasonings. 4. Place the lid on the instant pot and seal shut. Close the pressure release valve and seal shut. Set the pot to manual, high pressure for 100 minutes. 5. When cooking cycle is complete, let pressure naturally release for 30 minutes. Open pot and carefully remove meat and shred. 6. Set the Instant Pot to saute and let the remaining cooking broth come to a boil. This will be your Au Jus. 7. Add meat to a hoagie bun and top with a slice of cheese. Add butter to the top bun and broil for 2-3 minutes until bun is crispy and cheese is melted. Serve with au jus for dipping.