Add the broth, minced garlic, artichoke hearts, thawed spinach, cubed cream cheese, mayonnaise, sour cream, salt, onion powder, pepper, and red pepper flakes to the instant pot.
Cover the instant pot with the lid and make sure the valve is set to “sealed”.
Cook on “pressure cook” for 3 minutes.
Once the timer has gone off, let the pressure naturally release for 1 minute. After 1 minute, carefully flip the valve to do a quick release of the pressure.
Once the pin has dropped, open the lid and stir the dip. Add the parmesan and monterey jack cheeses and stir well to combine.
Serve warm with tortilla chips, pita chips, bread slices, veggies, etc.