Follow these simple steps to create your Chicken Enchiladas with Dreamy White Sauce:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Chicken Filling: In a large bowl, mix together the shredded chicken, sour cream, ½ cup of shredded cheese, garlic powder, onion powder, cumin, chili powder, and diced green chilies (if using).
3. Soften Tortillas: Lightly heat the corn tortillas in a dry skillet or microwave until they are pliable.
4. Fill Tortillas: Spoon some of the chicken mixture into each tortilla, rolling them up tightly.
5. Arrange in Baking Dish: Place the filled tortillas seam-side down in a greased 9×13-inch baking dish.
6. Add White Sauce: Pour the white sauce evenly over the enchiladas, ensuring they are well covered.
7. Top with Cheese: Sprinkle the remaining shredded cheese over the top.
8. Bake: Place the baking dish in the preheated oven and bake for 30-35 minutes, or until the enchiladas are heated through and the cheese is bubbly and golden.
9. Cool: Remove from the oven and let cool for about 15 minutes before serving.
10. Garnish: Sprinkle with fresh cilantro for a burst of flavor.

These steps will help you create an incredible dish that will impress your family and friends.