1. Place oil into the Instant Pot and place roast in pot. Sautee until browned.2. Add broth and sprinkle seasoning packets on top of roast and in the pot. Place peppers on top of roast.3. Place the lid on the Instant Pot and seal shut. Close the pressure release valve. Set the Instant Pot to manual, high pressure for 45 minutes.4. When the cooking cycle is complete, let pressure naturally release for 20 minutes. Open the lid and use two forks to shred the beef and remove bones, or remove roast from pot and slice and shred on a plate. Remove peppers from pan and cut with a knife, discarding seed bunch and stem, mix in with the beef.3. Return beef to pan and mix with juice. Serve over a bed of mashed potatoes if desired.