Preheat your oven to 350°F (175°C).
In a large bowl, combine shredded chicken, sour cream, cream of chicken soup, half of the cheese, onions, green chilies, garlic powder, salt, and pepper.
Mix until well combined.
Warm the tortillas slightly to make them pliable.
Spoon a generous amount of the chicken mixture onto each tortilla.
Roll the tortillas tightly around the filling and place them seam-side down in a greased baking dish.
Pour the enchilada sauce evenly over the rolled tortillas.
Sprinkle the remaining cheese on top.
Cover the dish with foil and bake for 20 minutes.
Remove the foil and bake for an additional 5 minutes until golden and bubbly.