Put 2 Tbs. of butter in a saucepan with the onion and green pepper. Cook until tender. When they are done cooking, combine them with the chicken and green chilies in a medium bowl.
Now, in the same pan, add the 3 Tbs. of butter, flour, salt, and coriander and whisk for about 3 minutes. Slowly add in your chicken broth a little a time. It will slowly turn into a sauce.
Remove from heat and add the sour cream and half of the cheese. Put a half of cup of this mixture into the chicken bowl.
One by one take the tortillas and dip them into the flour mixture and then put a handful of the chicken mixture into them. Roll it up and place it vertically in a greased pan. Do this for all of the tortillas. Top with the remaining cheese and put in the oven for 25 minutes. Enjoy!