Combine flour, salt, and pepper in a mixing bowl; then use it to coat the beef.
Warm oil in an Instant Pot on saute mode. Then, add the roast and sear it on each side for 4-5 minutes.
Add butter, onions, and pepperoncini. Then, place the lid on the pot but DO NOT secure it - simmer for 5 minutes.
Meanwhile, combine the ingredients for the ranch dressing in a small bowl and use a whisk to emulsify. Remove the lid from the pot and add the dressing.
Secure the lid, and set the Instant Pot to manual high pressure for 70 minutes with a 10-minute natural release. Remove the beef and let it rest on a cutting board for 10-15 minutes.
Use two forks to shred the meat and transfer it to a serving dish with some of the juices from the Instant Pot.
Notes
Expert Tips:
Sear the chuck roast in oil to create a tasty crust. You can skip this step if you're in a hurry, but taking the time to do so imparts flavor.
Let the meat rest for 10-15 minutes before shredding it; doing so allows the juices to redistribute throughout the meat, making it tender and juicy.
Nutrition Disclosure:
The nutritional information shown is an estimate provided by an online nutrition calculator. It should not be considered a substitute for professional advice.