Add the water to your instant pot liner.
Add the chicken, onion and garlic.
Add the noodles ontop of the chicken.
Add the sauce on top of the noodles. You want to do this so the sauce is away from the bottom surface to prevent the burn notice.
DO NOT MIX, but you do want the noodles all covered with sauce. Gently push the noodles down so there is no dry noodle sticking out.
Secure the lid and set to sealing.
Set the Instant Pot to 4 minutes.
After the time is up, carefully quick release the pressure.
Remove the lid. It will look soupy until you mix it and it cools a bit.
Add the Parmesan cheese and stir.
Add the mozzarella and place the lid back on for 2-3 minutes to get the cheese to melt. Or, you can just stir it right it. Your choice.
Add salt and pepper to your preferences.
Serve immediately, or portion into meal prep containers and store in the fridge for up to 4 days.