Step 1

Preheat an oven to 350 degrees F (175 degrees C).

Step 2

Melt the butter in a large skillet over medium-high heat. Stir in the chicken and cook until no longer pink in the center, about 7 minutes. Whisk together the condensed cream of chicken soup, sour cream, chiles, and ranch dressing in a bowl; spread a thin layer of the mixture into a 9x13 inch baking dish.

Step 3

Spoon about 2 tablespoons of sauce into each tortilla; divide the chicken among the tortillas and sprinkle with 3/4 of the cheese. Roll the tortillas into cylinders and place seam-side-down into the baking dish. Pour the remaining sauce over the enchiladas and cover the dish with aluminum foil.

Step 4

Bake in the preheated oven until hot, about 35 minutes. Remove the foil and sprinkle with the remaining cheese. Return to the oven and cook a few more minutes until the cheese melts.