Combine shredded chicken breast with, 1/2 teaspoon cumin, chili powder, and salsa. Evenly distribute chicken mixture over center of tortillas, roll and place seam side down in a 9 x 13-inch casserole pan. Set aside.
In a large pot, melt butter over medium heat and sprinkle in flour. Cook for 1 minute while stirring continuously. Slowly pour in chicken broth. Stir until mixture starts to thickened, about 6 minutes. Add 1/2 teaspoon cumin, 1 cup cheese, green chiles, sour cream, salt and pepper. Stir until cheese is melted.
Pour white sauce over enchiladas, sprinkle on 1/2 cup cheese and bake 25 minutes, or until cheese is lightly golden. Sprinkle chopped cilantro over enchiladas.