Cut green pepper and onion up and sauté in butter.
Add chicken to mixture. Once warmed up add fajita seasoning and 3/4 c. water. Simmer until mixture is a little thicker.
In a separate pot add soup, cubed cheese and sour cream. Allow that to come to a slight boil. Once cheese sauce is thick and mixed together, turn off the heat.
Grease a 9 x 13 " pan. Put chicken mixture into tortillas and roll them. Line them up in pan, then pour cheese mixture over entire dish. Sprinkle with shredded cheese. Bake at 425 for 30-45 minutes.
Let stand for 5 minutes and enjoy! *For a little more spice, add a small can of green chilies to cheese mixture.