Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine the shredded chicken, cream cheese, sour cream, garlic powder, onion powder, cumin, and half of the Monterey Jack cheese. Mix until well combined.
Spread a thin layer of green enchilada sauce on the bottom of a 9x13 inch baking dish.
Take a tortilla and spoon about 1/4 cup of the chicken mixture into the center. Roll the tortilla tightly and place it seam-side down in the baking dish. Repeat with the remaining tortillas and chicken mixture.
Once all the tortillas are in the baking dish, pour the remaining green enchilada sauce over the top. Sprinkle the remaining Monterey Jack cheese evenly over the sauce.
Bake in the preheated oven for 25-30 minutes, or until the cheese is melted and bubbly.
Remove from the oven and let cool for a few minutes. Garnish with chopped green onions and cilantro before serving.