Season the chicken breast on both sides with Italian seasoning, salt and pepper.
Add half the marina sauce and the garlic to the Instant Pot insert and and mix.
Place the seasoned chicken on top, then cover with the remaining marinara.
Cover and seal your Instant Pot, set to high pressure, pressure cook (or manual) for 3 minutes.
Once done, perform a quick pressure release (QPR).
Open the lid and sprinkle on the parmesan and mozzarella. Place the lid back on for a few minutes so the cheese melts.
Sprinkle on parsley and serve over pasta or mashed potatoes.