Add Oil and onions.Saute till they turn translucent.Cancel Saute.
Add the carrots, ginger, bay leaf, broth and salt.Mix it up.
Close the lid and select PRESSURE COOK for 5 minutes on HIGH.Let the pressure release naturally if you have the time.if not, then do a controlled release after 5 minutes.(Read notes for more details)
Open the pot, using a hand blender, blend the soup into a smooth consistency.