Creating Creamy Chicken Enchiladas with White Cheese Sauce is straightforward when you follow these steps:

1. Preheat the Oven: Set your oven to 350°F (175°C).
2. Prepare the Filling: In a large bowl, combine the shredded chicken, sour cream, cream of chicken soup, garlic powder, onion powder, cumin, chili powder, salt, and pepper. Mix well until everything is combined.
3. Assemble the Tortillas: Place a generous amount of the chicken mixture into each flour tortilla. Roll them up tightly and place them seam-side down in a greased baking dish.
4. Prepare the Sauce: In a separate bowl, mix together the shredded Monterey Jack and cheddar cheeses. Reserve ½ cup for topping later.
5. Add Cheese Sauce: Pour the remaining cheese mixture evenly over the enchiladas, ensuring they are well-covered.
6. Bake: Place the baking dish in the preheated oven and bake for 30-35 minutes, or until the cheese is bubbly and golden.
7. Garnish: Once baked, remove from the oven and let it cool for a few minutes. Garnish with fresh cilantro if desired.
8. Serve: Cut into portions and serve warm.

By following these steps, you’ll have a delicious dish ready to impress. The creamy sauce and tender chicken will leave everyone satisfied!