Creating White Chicken Enchiladas is simple when you follow these easy steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Cook Onions and Garlic: In a skillet, heat olive oil over medium heat. Add the chopped onion and minced garlic. Sauté until the onion is translucent.
3. Mix Filling: In a large bowl, combine the shredded chicken, sour cream, cream of chicken soup, sautéed onions and garlic, cumin, chili powder, salt, and black pepper. Mix well.
4. Prepare Tortillas: If needed, warm the tortillas in the microwave for about 20 seconds to make them pliable.
5. Fill Tortillas: Spoon a generous amount of the chicken mixture into the center of each tortilla. Sprinkle with a little Monterey Jack cheese, then roll up the tortilla tightly.
6. Arrange in Baking Dish: Place the filled tortillas seam-side down in a greased 9×13 inch baking dish.
7. Cover with Sauce: In a separate bowl, mix the remaining cream of chicken soup with a little water to thin it out. Pour this sauce over the rolled tortillas.
8. Top with Cheese: Sprinkle the remaining shredded cheddar cheese on top of the enchiladas.
9. Bake: Bake in the preheated oven for 25-30 minutes, or until the cheese is bubbly and golden brown.
10. Garnish and Serve: Remove from the oven and let it cool for a few minutes. Garnish with fresh cilantro if desired.

These steps will guide you through making delicious White Chicken Enchiladas that are sure to impress!