Set the Instant Pot to saute. Add olive oil to the pot and wait for it to heat up. Cut the roast into 3-4 smaller pieces and season liberally with salt and pepper. Place one piece of the roast in the pot at a time, searing on all sides. When all the meat has been seared, place all pieces in a single layer in the bottom of the Instant Pot.
Whisk the brown gravy mix and onion soup mix packets in to the beef broth and pour mixture over the meat in the Instant Pot.
Add the potatoes on top of the meat, followed by the carrots and then the onion to the Instant Pot.
Close the lid, set the valve to seal and cook on manual for 35 minutes. When the time is up let the Instant Pot do a natural release for 10 minutes and then quick release the rest of the pressure.Spoon the onion, carrots, and potatoes on the a serving platter and top with the roast.
Use remaining liquid in the Instant Pot to pour over the roast, if desired. Garnish with fresh chopped parsley.