Heat olive oil in a large skillet over medium heat.
Add chopped onion and cook for 4 minutes or until transparent.
Stir in green chilies, flour, and cumin. Cook and stir for 2 minutes.
Add great northern beans and chicken broth, bringing mixture to a boil.
Reduce heat and simmer for 10 minutes or until thickened.
Add cooked chicken and cook until heated through.
Serve hot, garnished with Monterey Jack cheese, sour cream, and salsa as desired.