01 - 
                Preheat oven to 375°F (190°C). Grease a 9×13-inch baking dish.
              
              
              
                02 - 
                In a pan over medium heat, melt butter and whisk in flour. Cook for 1 minute.
              
              
              
                03 - 
                Gradually whisk in chicken broth and green enchilada sauce, stirring until thickened.
              
              
              
                04 - 
                Stir in sour cream, green chilies, garlic powder, onion powder, cumin, salt, and black pepper.
              
              
              
                05 - 
                In a bowl, combine shredded chicken with 1/2 cup shredded cheese.
              
              
              
                06 - 
                Divide the chicken mixture among tortillas, roll them up, and place them seam-side down in the baking dish.
              
              
              
                07 - 
                Pour the sauce evenly over the enchiladas and sprinkle the remaining cheese on top.
              
              
              
                08 - 
                Bake for 20 minutes until cheese is melted and bubbly.
              
              
              
                09 - 
                Garnish with chopped cilantro or diced tomatoes if desired. Serve warm.