Add the chicken breast, onion, garlic, black beans, white beans, corn, rotel tomatoes, cream cheese, milk, chopped peppers, celery, chicken broth and seasonings into the instant pot bowl.
Close the lid and seal and cook on high pressure for 25 minutes. Once cooked, release the pressure and remove the chicken breast.
Using two forks, shred the chicken breast and then put the shredded chicken back into the pot and mix the soup.