Place olive oil, onion and garlic into the Instant Pot’s inner pot and set to saute.
Cook the garlic and onion for about 2 minutes.
Add chopped chicken and brown on all sides, for about 3-4 minutes.
Remove the chicken from the inner pot and place on a plate.
Add water into the inner pot and use a wooden spoon to remove all the brown bits from the bottom of the inner pot.
Add pasta and chicken back into the inner pot.
Close the Instant Pot and set to manual high pressure for 7 minutes.
Once the time is up, allow for a 10 minute NPR.
Remove the Instant Pot’s lid and stir in pasta sauce and Parmesan cheese.
Add mozzarella on top and serve in individual bowls. Add additional mozzarella cheese, if desired.