- Preheat your oven to 350°F (175°C). 
- In a large mixing bowl, combine the shredded chicken, 1/2 cup of green enchilada sauce, 1/2 cup of shredded cheese, sour cream, diced onion, cilantro, cumin, garlic powder, salt, and black pepper. Mix well until all ingredients are evenly combined. 
- Warm the corn tortillas in a dry skillet over medium heat for about 30 seconds on each side to make them pliable. 
- Spread 1/4 cup of green enchilada sauce on the bottom of a 9x13-inch baking dish. 
- Take a tortilla, fill it with about 1/4 cup of the chicken mixture, and roll it up tightly. Place the rolled tortilla seam-side down in the baking dish. Repeat with the remaining tortillas and filling. 
- Once all the enchiladas are in the dish, pour the remaining green enchilada sauce over the top and sprinkle with the remaining cheese. 
- Cover the dish with aluminum foil and bake for 20 minutes. Remove the foil and bake for an additional 10 minutes, or until the cheese is bubbly and golden. 
- Let the enchiladas cool for a few minutes before serving. Garnish with additional cilantro if desired.