Here's a simple all-in-one recipe for your pressure cooker with basically no prep work. It will be done in only 20 minutes including the time to build up pressure.
Throw 20-30 meatballs (thaw first if frozen) into the pot. Add one can cream of mushroom soup, one can golden mushroom soup, 1 Tablespoon beef bouillon, paprika, black pepper, and egg noodles. Stir gently.
Pour enough water over to just cover the noodles...
Cook on soup/stew setting for 10 minutes.
The gravy will thicken a bit as it sits.