Southwest Black Bean Chicken Soup

1 pound cooked dark meat chicken

3 (15.5 ounce) cans black beans, drained and rinsed

2 (14 ounce) cans chicken broth

2 (10 ounce) cans diced tomatoes with green chile peppers (such as RO*TEL®)

1 (15.25 ounce) can whole kernel corn

½ large onion, chopped

½ cup chopped jalapeno peppers

2 cloves garlic, chopped

2 ½ teaspoons chili powder

2 teaspoons red pepper flakes

2 teaspoons ground cumin

1 teaspoon ground coriander

salt and ground black pepper to taste

½ cup sour cream, or to taste