Preheat the oven to 350 degrees and lightly grease a 9x13 inch baking dish.
In a mixing bowl, stir together the shredded chicken, sour cream, and 1 cup of the cheddar cheese.
Pour a thin layer of mild enchilada sauce into the bottom of the baking dish.
Place four tortillas over the sauce, overlapping them slightly to cover the bottom.
Spread half of the chicken mixture evenly over the tortillas.
Drizzle half of the remaining enchilada sauce over the chicken layer.
Sprinkle 1 cup of cheddar cheese over the sauce.
Repeat the layers with the remaining four tortillas, chicken mixture, enchilada sauce, and final cup of cheddar cheese.
Bake uncovered for 25 minutes until the cheese is fully melted and the edges are lightly golden.