Preheat the oven to 350°F (175°C).
In a small bowl, combine the shredded chicken, 1 cup of the shredded cheese, the chopped green chiles, and season with garlic salt and pepper to taste.
Pour the enchilada sauce into a small skillet and heat until it comes to a gentle simmer; keep warm on low.
Briefly dip each corn tortilla into the warm enchilada sauce to soften it, then lay it flat on a work surface.
Place a tortilla in the baking dish and spoon about 1/3 cup of the chicken mixture down the center, then add about 2 tablespoons of sour cream on top of the chicken.
Roll the tortilla tightly and place it seam-side down in the baking dish; repeat with the remaining tortillas and filling.
Pour any remaining enchilada sauce over the assembled enchiladas so they are covered, then sprinkle the remaining 1 cup of shredded cheese evenly on top.
Bake uncovered for 20 minutes, or until the cheese is melted and bubbly.