Heat your pressure cooker to medium-saute and add the oil.
Once the Instant Pot is preheated, add the chicken.
Cook for about 2 minutes per side until lightly browned.
Remove the chicken from the pot. Add more oil if necessary.
Add the spinach and sun-dried tomatoes and saute until the spinach wilts, about 1 minute. Add the garlic and cook for 30 more seconds.
Add the chicken broth or wine to the pot. Use a wooden spoon and scrape up any browned bits stuck to the bottom of the pot.
Hit cancel.
Add the heavy cream. Add the trivet to the pot and place the chicken on top of the trivet. Seal the pot and set to high pressure for 2 minutes.
Let the pressure release naturally for 5 minutes, and then do an instant release. Remove the chicken from the pot using tongs, and then remove the trivet.
Add the lemon juice and remaining ⅓ cup of parmesan cheese and cover. Let sit covered for about 5 minutes until the cheese melts.
Return the chicken to the Instant Pot and coat with the sauce.