Select Saute (more or high) and add the oil to the inner pot. When the pot is hot, add in the onion and saute for 3-4 minutes until translucent.
Add in the broth, shredded chicken, black beans, kidney beans, corn, garlic powder, onion powder, chili powder, creole seasoning, cumin, salt and pepper and stir to combine.
Lock the lid and set the steam release valve to the sealing position. Select Pressure Cook (high) and set the cook time for 2 minutes.
Press Cancel to turn off the Keep Warm mode and select Saute (more or high).
Bring the soup up to a simmer to thicken slightly and then remove the inner pot from the Instant Pot base to stop the cooking. Do not allow to boil heavily after adding the half and half.
This recipe works well in 6 or 8qt size pressure cookers. If you are using a 3qt pressure cooker, reduce all of the ingredients in half. The cook time remains the same.
As an alternative to using prepared salsa you could use a 14oz can of diced tomatoes and a 4oz can of diced green chilies or 2 de-seeded and finely chopped jalapeños.