Cut up and saute the onion in olive oil. Cook until translucent.
Add in the chicken and cook and blend together
Pour in a small portion of the enchilada sauce, enough to coat the onions and chicken.
Add in the 1/2 cup of sour cream, fold well and mix all the ingredients together.
Lower the heat and add-in 1 cup of the shredded cheddar cheese.
Add in a handful or two of the green chiles and fold well into the mixture.
In a 9 by 12 pan spray non-stick spray at the bottom of the pan.
Pour a very small amount of the enchilada sauce and coat the bottom of the pan.
Fill and roll all of the tortillas with the mixture, should make 6 to 8 enchiladas.
Pour the remaining enchilada sauce over the top, use the last of the cheddar cheese and chiles to the top.
Bake at 350 degrees for 30 to 35 minutes! Enjoy!