Add the oive oil to the pot and swirl around to coat the base.
Now add the meatballs (they can be frozen or fresh, raw or cooked).
Snap the spaghetti in half and layer over the meatballs.
Season to taste and then add the chicken stock.
Add the pasta sauce, tomatoes and Italian seasoning. Push the spaghetti down into the liquid but DO NOT STIR.
Put the lid on and set to high pressure for 4 minutes.
When the time is up, leave under pressure for another 4 minutes and then do a quick release.
When the pin drops, remove the lid and gently stir everything together. Tease apart any stuck together spaghetti using 2 forks.
Serve garnished with the parmesan and enjoy!