Completely thaw pork chops and place them on a flat surface. Sprinkle both sides generously with salt and pepper.
Set Instant Pot to saute. Heat the olive oil and add the pork chops to the pot. Cook for 2 minutes per side. Do this in batches, if needed, and transfer to a cutting board.
Add beef stock or broth and Worcestershire and deglaze the pot (scrape bits from the bottom of the pan with a spoon). Add the mushrooms, followed by the pork chops and top with the cream of mushroom soup. Sprinkle the soup mix over the top.
Cover and cook on high pressure (use the pressure cook setting) for 10 minutes. It will take the pot approximately 10 minutes to build up pressure before it begins cooking. Let the pressure release naturally for 5 minutes, then do a quick release.
Remove the pork chops from the pot and place on a cutting board using tongs. Cover to keep warm. Press cancel and then press the saute button. Bring the gravy mixture to a boil. Let it boil for 10 minutes, or until desired consistency has been reached.
Remove the inner pot, ladle the gravy over the pork chops and serve!