Season the roast: In a small bowl, mix together the salt, onion powder, garlic powder, black pepper, and smoked paprika. Rub the seasoning mixture all over the chuck roast.
Sear the roast: Turn the Instant Pot to Sauté mode. Add the oil and sear the roast for 2–3 minutes on each side until browned. Remove and set aside.
Deglaze the pot: Add beef broth and Worcestershire sauce to the pot. Use a wooden spoon to scrape up any browned bits from the bottom.
Add vegetables and roast: Return the seared roast to the pot. Arrange the potatoes, carrots, and diced onion around the meat.
Pressure cook: Secure the Instant Pot lid and set to High Pressure. Cook for:
60 minutes for a 3 lb roast
80–90 minutes for a 4–5 lb roast
Release pressure: Let the pressure release naturally for 10 minutes, then carefully perform a quick release.
Shred the meat: Remove the roast and vegetables from the pot. Shred the roast into large chunks.
Make the gravy: Turn the Instant Pot to Soup/Broth mode. In a small bowl, mix water and cornstarch into a slurry, then stir it into the hot broth. Cook until the gravy thickens.
Serve: Spoon the gravy over the meat and vegetables. Garnish with chopped parsley or thyme, if desired.
Notes
Cooking from frozen: Skip searing and increase cooking time by 20–30 minutes.
Baby carrots tip: For firmer carrots, cook the roast 10 minutes less, then add carrots and cook 10 minutes more.
Leftovers: Store in an airtight container in the refrigerator for up to 4 days.