Turn on Instant Pot and select "Saute." Add olive oil to the cooking pot. Season pork chops with steak seasoning and brown each pork chop 2-3 minutes per side. Remove pork chops to a plate while browning the others.
Add butter to instant pot. Continue the "Saute" function and cook mushrooms, onion, and garlic for about 3 minutes until tender. Add in chicken broth, salt, and pepper. Use your wooden spoon to deglaze the bottom of the pot by vigorously pushing the bits of cooked meat and vegetables off the bottom of the pot.Add pork chops to instant pot and secure lid in place.
Select "Pressure Cook" on high level for 15-18 minutes, depending on thickness of pork chops (see above). When the cook time ends, all the pressure to release naturally for 10 minutes. Then do a quick release.
Transfer pork chops to serving dish. Make the gravy by turning the instant pot on "Saute."
In a small bowl, whisk together cornstarch with about 1/4 cup of the hot broth from the instant pot. Pour whisked mixture into the instant pot and continue whisking until mixture bubbles and sauce thickens.
Whisk in heavy cream, season with more salt and pepper to taste. Pour over pork chops and serve.
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Notes
For best flavor, choose thicker pork chops that have marbling of fat throughout.
Use a gravy browner with the heavy cream if you want a darker brown gravy.
This recipe was tested in an Instant Pot 6qt Duo. Adjustments may be needed in a different size.
Make sure you take into account the time needed for the Instant Pot to come to pressure. If using frozen pork chops, the time to pressure will be longer, but cook time remains the same.