Preheat the oven to 350℉ (175℃). Spray a 2-quart or 9x9 baking dish with cooking spray.
In a large mixing bowl, mix 8 ounces cream cheese, 2 (4oz) cans mild diced green chiles, 1 teaspoon ground cumin, 1 teaspoon garlic powder and ¼ teaspoon kosher salt together until smooth and well combined. Fold in 3 cups cubed or shredded cooked chicken and mix to coat.
Spread a thin layer of enchilada sauce (~¼ cup) over the bottom of the baking dish. Layer 2-3 tortillas, cutting in half to fit if needed, over the sauce so that the bottom of the pan is covered.
Spread half of the chicken mixture over the tortillas. Drizzle a ½ cup enchilada sauce over the mixture of chicken, and then sprinkle with ½ cup of cheese. Repeat this process. Top with a final layer of tortillas and then pour the remaining enchilada sauce over the tortillas, spreading to cover. Sprinkle the remaining cheese over the casserole.
Cover with foil and bake for 30 minutes. Uncover and bake for an additional 10 minutes, or until cheese is melted and browned.
Remove the casserole from the oven and let rest for 5-10 minutes before serving with desired toppings.
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Notes
Enchilada Sauce: Use your favorite red or green enchilada sauce. For this recipe, I used my homemade enchilada sauce. Control Spice: Use mild enchilada sauce and mild green chiles to prevent an overly spicy dish.Gluten-Free: Use your favorite gluten-free or corn tortillas and ensure your enchilada sauce is gluten-free. Double Recipe: Double ingredients and bake as directed in a 9x13-inch baking dish, adding 5-10 minutes if needed to warm through. Storage: Leftover enchilada casserole can be stored in an airtight container for up to 3 days in the refrigerator. Warm individual servings in the microwave on high for 1 to 2 minutes. To reheat the whole casserole, cover loosely with foil and warm in a 350°F oven for about 20 minutes.Make-Ahead: Assemble as directed, cover tightly with foil, and refrigerate for up to 24 hours before baking. Let come to room temperature for 20-30 minutes to take the chill off. Then bake as directed, adding 5-10 minutes to warm through if needed.I don't recommend freezing due to the cream cheese layer, as it can separate a bit when thawed and baked.