Put pot on saute and add olive oil with steaks. Sear on outsides. Remove and deglaze the pot using 1/4 c of broth. Slice onion and put on bottom of pot.
Season steak with salt, pepper and anything else you desire and place on top of onions. Try to overlap the least possible.
In a bowl whisk together rest of your broth, onion soup mix/or package of dry gravy mix, steak sauce and minced garlic. Pour this over your steak.
Cut potatoes into quarters and place inside pot on sides of steak. Sprinkle salt and pepper on potatoes.
Close lid and steam valve and set to high pressure for 5 minutes. (NOTE: timing will vary depending on how thick and large your pieces are and how well done you like them but this has been perfect for us)
Allow to naturally release steam when done, this will take about 15 minutes.
Remove steak, potatoes and onions and set pot to saute if you want to thicken sauce.
In a bowl whisk together cornstarch and water until smooth. Once it is boiling add this in and stir for 1-2 minutes so it thickens. Turn pot off and pour this sauce over potatoes and steak.