Heat the olive oil in a large skillet over medium heat.
Add the chopped onion and cook for about 4 minutes, stirring occasionally, until soft and translucent.
Stir in the green chilies, flour, and ground cumin.
Cook for 2 minutes, stirring constantly, to remove the raw flour taste and bloom the spices.
Add the Great Northern beans and chicken broth.
Stir well and bring the mixture to a boil.
Reduce the heat to low and simmer for 10 minutes, allowing the chili to thicken.
Stir in the cooked chicken and cook just until heated through.
Serve hot, garnished with shredded Monterey Jack cheese, sour cream and salsa.