Set pot to saute and add olive oil. Sprinkle chunks of beef with seasonings and brown on all sides until no longer pink. Turn pot off. Remove and add 1/3 cup of your broth to scrape bits of cooked on meat off bottom of pot.
Put meat back in with your broth, onions, Worch. sauce and halved mushrooms.
Close lid and steam valve and set to high pressure for 15 minutes with a 5 minute natural release of pressure. Let out rest of steam and remove lid.
Set pot to saute again. In a bowl whisk together remaining 1/3 cup broth with gravy packet and add that in pot. Allow to bubble and thicken. Turn turn pot off and serve.