Preheat oven to 350°F. Chop chicken into 1 inch cubes and fry in a pan until no longer pink.

Mix sour cream, chiles, and cream of chicken in a sauce pan. Stir on medium heat until heated all the way through.

Shred the cooked chicken. Chop up the onion into fine pieces.

Disperse onion and chicken, along with about 3/4 cup of cheese, on all 4 tortillas. Roll them up and place them flap down in a square cake pan.

Spread sauce evenly over the top. Sprinkle remaining shredded cheese. Cook for 10-20 minutes, until cheese is melted and sauce is bubbling slightly.