Set the pot to saute and add the olive oil and butter.
When the butter has melted add the chicken breasts and roughly brown on each side (season the chicken on each side whilst cooking). This should take around 2 minutes.
Add the garlic, followed by the stock, Italian seasoning and cream. Deglaze the pot if necessary.
Put the lid on the instant pot and set to high pressure for 5 minutes. When the time is up, leave under pressure for another 5 minutes.
Do a quick release and remove the lid. Add the sun-dried tomatoes, parmesan and spinach. Stir everything together and put the lid back on loosely until the spinach wilts (around 3 minutes).
Remove the lid and stir again.
Serve over rice or pasta and enjoy.