In a 6qt pot saute the onion and jalapeno with 2 teaspoons of oil.
Add in the chicken broth, diced tomatoes (along with juice in the can)
If you are using raw chicken, cut it into small pieces and add the chicken now (If using cooked chicken like I did add it at the end.
Add the chili powder, oregano, and cumin.
Once the soup comes to a boil over medium heat, add the corn and black beans, and cooked chicken.
Add salt and pepper to taste.
Ladle the soup into bowls and top with cilantro, diced green onions, lime juice, and tortilla chips and cheese.