Pour 2 c beef broth into pot with meat in the center of the pot. Sprinkle with dry onion soup mix packet.
Close lid and steam valve. Cook on high pressure for 90 minutes with a 15 minute natural release.
Remove roast and cover with foil to keep warm. Turn pot to saute and add dry gravy packet into liquid in pot and whisk together. In a small bowl whisk together cornstarch and 1/4 c. water until smooth.
Once bubbling pour in this cornstarch slurry. Allow to thicken stirring slowly in pot. Then turn off and pour into gravy boat.