Preheat the oven to 350°F (175°C).
In a small bowl, mix the shredded chicken with 1 cup of the shredded cheese, the chopped green chiles, and garlic salt and pepper to taste.
Pour the enchilada sauce into a small skillet and heat until it comes to a simmer; reduce heat to keep warm.
Dip each corn tortilla into the warm enchilada sauce for a few seconds to soften, then place it on a work surface.
Place the softened tortilla in the baking dish and add about 1/3 cup of the chicken mixture and 2 tablespoons of sour cream down the center of the tortilla.
Roll the tortilla tightly and place seam-side down in the baking dish. Repeat with the remaining tortillas and filling.
Pour enough of the warm enchilada sauce over the rolled enchiladas to cover them, then sprinkle with the remaining 1 cup of shredded cheese.
Bake uncovered for 20 minutes, or until the cheese is melted and bubbly.