Instant Pot Mississippi Pot Roast with butter, ranch, au jus, pepperoncinis, and a nice chuck roast, this is an absolute classic pot roast. You can make it so much faster in your pressure cooker!
Turn pot on Sauté mode (normal). When the display reads "Hot" add the oil.
When oil heats up, place meat in one layer into the pot and don't move it for 5 full minutes (Don't brown for less than that).
Turn meat over and cook for another 5 full minutes.
Deglaze the pot: Add onion to pot and stir, add a bit of the beef broth or a small amount of water if there is not enough moisture to loosen the brown bits from the bottom of the pot. Stir, scraping the bottom of the pot until the bottom is free of the stuck on brown bits.
Add the pepperoncinis and their juice, beef broth, au jus and ranch packets, and butter. Stir to combine.
Turn off the sauté mode.
Add the meat back into the pot.
Close lid and set the steam release knob knob to the Sealing position.
Press the Pressure Cook or Manual button (or use dial) then the +/- button to select 60 minutes. High Pressure. It will take several minutes to build pressure.
When the cooking cycle ends, let the pot sit undisturbed and count up to 15 min (15 minute natural pressure release, or NPR).
After the 15 minute NPR, turn off the pot and manually release the remaining pressure by turning the steam release knob to the Venting position.
When the pin in the lid drops back down, open the lid.
Remove the pot roast to a plate and cover.
Turn the Sauté function back on.
Mix the flour and butter together until well combined.
When the liquid is starting to simmer, add the mixture to the pot, stirring well until thickened. Then turn off the pot and add the roast back in.
Enjoy with mashed or baked potatoes, or over rice.
Alternate "Dump and Start" Method:
Add the roast to the pot (still cut it into 1 lb chunks), then the rest of the ingredients in order (minus the flour and softened butter for gravy), and cook on High Pressure for 80 minutes. 15 minute natural release (If you have a roast that is over 4 lbs, and can't cut it, then increase the cook time to 90 minutes).
Adapted from original recipe by Robin Chapman.