Pat the pork loin dry with paper towels and season it generously with salt, pepper, garlic powder, onion powder, and thyme.
Turn the Instant Pot to sauté mode and heat the olive oil. Brown the pork loin on all sides for about 2-3 minutes per side until golden.
Remove the pork and set aside. Add the minced garlic and onion to the pot and sauté until fragrant.
Pour in the chicken broth, scraping the bottom of the pot to release any browned bits.
Return the pork loin to the pot and arrange carrots and potatoes around it.
Lock the lid and set the Instant Pot to high pressure for 25 minutes. Once it’s done, allow a 10-minute natural release before venting the rest of the steam.
Remove the pork and vegetables. If you’d like a thicker sauce, mix the cornstarch and water, then stir it into the remaining juices on sauté mode until thickened.
Slice the pork and serve it alongside the vegetables, drizzled with that luscious sauce.