Slow Cooker Chicken Taco Soup

onion, chopped

chili beans (not already prepared chili)

black beans

corn, drained

tomato sauce

chicken broth

diced tomatoes with green chilies

pkg. taco seasoning

skinless, boneless chicken breasts (I like a lot of chicken in mine so I used 4)

Shredded cheddar cheese

Crushed Tortilla chips

sour cream (optional)