Step 1

Turn on a multi-functional pressure cooker (such as Instant Pot®) and select Saute function. Add butter once the pot is hot. Add onion and stir frequently until soft and fragrant, about 5 minutes. Add garlic base and pour in water. Stir to combine.

Step 2

Mix all-purpose seasoning and shallot salt together in a bowl and sprinkle on both sides of the pork chops. Nestle pork chops on top of the onion. Hit Cancel. Seal and lock the lid into place.

Step 3

Select high pressure according to manufacturer's instructions; set timer for 13 minutes. Allow 10 to 15 minutes for pressure to build.

Step 4

Release pressure using the natural-release method according to manufacturer's instructions for 12 minutes. Release remaining pressure carefully using the quick-release method according to manufacturer's instructions, about 5 minutes. Unlock and remove the lid.

Step 5

Remove pork chops to a plate. Hit Cancel and switch to Saute function. Add mushrooms and stir.

Step 6

Whisk whipping cream, flour, and browning sauce together in a measuring cup. Add mixture to the Instant Pot®. Allow to thicken slightly, about 3 minutes. Ladle mushroom gravy on top of pork chops. Serve immediately.