Turn the Instant Pot to Saute and add the oil. Let it heat for a few minutes.
2 Tablespoons oil
Brown the beef roast in the Instant Pot, quickly, turning to get all sides.
3 pound beef chuck roast
Turn the Instant Pot off. Take the beef out and quickly deglaze the inner pot with the liquid from the jar of pepperoncini. Stir and scrape the bottom of the pot to make sure there are no browned bits left on the bottom.
1 jar pepperoncini
Put the roast back in and add the garlic, onion, and green pepper on top of the roast.
1 clove garlic, 1 onion, 1 green pepper
Open the salad dressing mix and sprinkle it on top of the roast. Then add all the pepperoncini to the pot.
1 envelope Good Seasons Salad dressing
Set the Instant Pot on Manual, High pressure, for 60 minutes.
When the cook time is done release the pressure manually.
Take the roast out and use two forks to shred the beef. Return the shredded beef to the Instant Pot and stir into the liquid.
Serve immediately or replace the lid and let the meal stay warm until dinner time.
Serve the beef on rolls with provolone or mozzarella cheese.
6 rolls, 6 slices provolone
Notes
If you have a 2 pound roast you can reduce the cook time to 50 minutes.
I made this in a 6 quart Instant Pot and you might need to make adjustments to for an 8 quart one. Most commonly you might need to add 1/2 cup to 1 cup of water. My pressure cooker has no problem reaching pressure with just the liquid from the jar of pepperoncini., but an 8 quart model would likely need more liquid.