White Bean and Chicken Chili

White Bean and Chicken Chili (in the instant pot)
from Linda Castillo, via the internet, with modifications

Ingredient
6 c chicken stock
2 cloves garlic, finely minced
1 medium onion, diced
1 1/2 c dry white northern beans
4oz can diced green chiles, undrained
1 t dried oregano
1 t ground cumin
1/2 t chili powder
1 t salt
1 t ground black pepper
2 cups cooked, shredded chicken (we use rotisserie)
3/4 c sour cream

Directions
Rinse and drain beans - no need to soak beforehand!  Add all the ingredients except chicken and sour cream to the pot.  Cook on manual high pressure for 32 minutes, then turn off and quick-release pressure. 
Add chicken to the pot and simmer for 12 minutes.  Add sour cream and serve.