Chicken Tortilla Soup

Chicken Tortilla Soup (from here, but I modified quite a bit)

Notes: I did this in the crock pot and shredded the chicken. I liked it very much! We served it with the Member's Mark tortilla chips from Sam's Club. So good!

1 onion, chopped
3 cloves garlic, minced
1 tbsp olive oil
2 tsp chili powder
1 tsp dried oregano
1 (28oz) can crushed tomatoes (I used 1 16oz can diced, might try 2 cans next time)
4 cups water + 4 tsp chicken stock powder (instead of canned)
1 cup whole corn kernals, cooked (I used canned)
1 4oz can chopped green chile peppers
1 15oz can black beans, rinsed and drained
1/4 cup chopped fresh cilantro (didn't have, but it would probably be good)
2 boneless skinless chicken breast halves (I used 4 frozen chicken breast tenderloins)

optional toppings:
tortilla chips
avacado
cheese
green onions

I dumped it all in the crock pot and put it on high for 4 hours. Check the original link for stove top directions.