Slice the onion into half-moons.
Turn the Instant Pot onto Saute mode and heat the olive oil. Brown the roast on all sides. Turn off the Instant Pot.
Pour in the hot water and season the roast with salt and pepper.
In a large mixing bowl, whisk together the cream of mushroom soup, white cooking wine and Worcestershire sauce. Then fold in the sliced onion and sliced mushrooms. Pour over the beef roast in the electric pressure cooker.
Steam valve: Sealing.
Cook on: Manual/High for 55 minutes.
Release: Natural or Quick.
Once finished cooking, shred the beef with 2 forks and mix into the sauce.
Prepare the veggies.
Prepare the mashed potatoes.
Serve Instant Pot Mushroom Pot Roast over mashed potatoes with side of veggies.