In a large saucepan heat oil over medium heat. Cook and stir the onion and garlic in hot oil about 4 minutes or until onion is tender; stir in the chili powder and cumin. Cook and stir for 1 minute more. Stir in beans, chicken broth, water, and chile peppers. Bring to boiling; reduce heat. Simmer, covered, for 10 minutes, stirring occasionally. Stir in the chicken and cilantro or parsley. Heat through. Top each serving with tortilla strips and cheese.