Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine the shredded chicken, sour cream, cream of chicken soup, 1/2 cup of the shredded cheese, garlic powder, onion powder, cumin, chili powder, salt, and pepper. Mix until well combined.
Take a tortilla and spoon about 1/4 cup of the chicken mixture onto the center. Roll the tortilla tightly around the filling and place it seam-side down in a greased 9x13 inch baking dish. Repeat with the remaining tortillas and filling.
Pour the green enchilada sauce evenly over the rolled tortillas in the baking dish. Sprinkle the remaining 1/2 cup of shredded cheese on top.
Bake in the preheated oven for 25-30 minutes, or until the cheese is melted and bubbly.
If desired, garnish with chopped cilantro before serving.