Add a small amount of canola oil to a 4qt stock pot.
Heat for about 3 minutes over medium heat and add chicken pieces; cook and stir 3 minutes.
Add onion, garlic, chili powder and cumin. Cook and stir 2 minutes.
Stir in broth, tomatoes and chilies. Bring to a boil. Reduce heat and simmer 10 minutes.
Serve with shredded cheese, cilantro and tortilla strips. Garnish each bowl with lime slice to squeeze juice into soup, if desired.
This recipe makes about 4 servings and can easily be doubled.