Prepare the steak by trimming any excess fat. Next, set your Instant Pot to sauté mode. Once it's hot, add the beef and sear it for about 2-3 minutes. After that, remove the beef from the Instant Pot.
In the same pot, add butter and minced garlic. Toss in the onions and sauté them for around 3 minutes. Pour in 1 cup of beef broth, making sure to scrape any flavorful bits stuck to the bottom with a wooden spoon. Then, add the remaining beef broth, wine, and Worcestershire sauce.
Return the beef to the Instant Pot and season it with salt. Set the Instant Pot to high pressure for 12 minutes. Once done, let it naturally release for 10 minutes before performing a quick release.
Take out the beef, discard any excess fat, and shred the meat. Add the shredded beef back into the pot.
When serving, place a slice of cheese in each bowl. Enjoy!