Rinse the cauliflower and break it into florets. Chop the florets into small pieces.
Place the cauliflower florets, chopped onion, minced garlic, chicken broth, garlic salt, and seasoned pepper in the Instant Pot. Stir well, and place the lid on the Instant Pot, until it beeps and locks. Make sure the pressure valve is set to Sealing, and press the Manual button, and set the time for 10 minutes.
When finished, let the Instant Pot naturally release the pressure, about 5 minutes. When the IP beeps, and goes to the Off setting, make sure the Float Value is down, and all the pressure has been released, and then remove the lid.
Add the cream cheese and use an immersion blender to stir the soup and make it into a creamy texture. Add about 8 oz (1 cup) of Parmesan cheese and stir well.
Ladle the soup into bowls, place two of the Parmesan croutons in each bowl, and drizzle a little oil from the sun-dried tomatoes on to the top of the soup. Top with crumbled bacon, and green onions.