Unwrap frozen stew meat and set inside your pressure cooker. In a bowl whisk together your broth and 2 packets of dry gravy mix. Pour this on top of your meat.
Seal lid and steam valve and cook on high pressure for 25 minutes with a 10 minute natural release. Release rest of pressure and break up meat so it is now submerged into the liquid below. Add garlic salt and pepper, stir.
If you want a thick gravy at the end, take out some of the hot liquid and whisk with the last gravy packet. Pour this in.
Seal lid and steam valve again and set to high pressure again for 35 minutes. Allow for a 10 minute natural release, then release rest of pressure.