Saute vegetables and spices: Select the saute setting on your pressure cooker. Add in the oil, onion, green pepper, ground cumin, ground coriander, and chili powder. Sautee for 2-3 minutes while stirring constantly until everything is mixed.
Add in garlic and saute for another 30 seconds or so.
Add in the rest of the ingredients: Add in the beans, chicken, corn, chicken stock, and salt and pepper. Give it a stir. Cancel the saute function.
Pressure cook the white bean chicken chili: Secure the lid and set the steam release valve to the sealing position. Select the manual setting and set the cooking time to 20 minutes at high pressure. It will take about 10 minutes for the Instant Pot to come to pressure.
Release the pressure: When the cooking cycle is complete, let the pressure naturally release for 8-10 minutes, then move the steam release valve to the venting position to release any remaining pressure. When the floating valve drops, carefully remove the lid.
Shred the chicken: Remove the chicken from the chili into a plate and shred it using two forks. Put it back in and give it a stir.
Stir in the cilantro, if using. Ladle into bowls. Top it off with your favorite toppings, i.e. avocado, sliced jalapenos, cheese, tortilla chips and cilantro. Finish it off with a dollop of sour cream (if using) and Serve.