Toss the chicken stock, Greek Yogurt, mayonnaise, onion powder, garlic salt, black pepper, spinach, artichokes, and cream cheese into the Instant Pot bowl.
Place the lid onto the Instant Pot.
Close the valve to seal.
Set the Instant Pot to High Pressure for 7 minutes.
Once the time is done, do a quick release by pushing the valve away from you to open the pressure.
Open the lid and mix well.
Mix in the Parmesan and mozzarella cheese.
Serve with your favorite vegetable, chip, or bread!