Creamy Chicken Enchiladas

1/4 c. butter
1 c. onion
1/4 c. flour
2 1/2 c. chicken broth
8 oz. sour cream
3 c. chopped chicken
1 can green chiles
1/2 t. chili powder
2 c. cheese (white, yellow, or both)
8-10 small tortilla shells

For the sauce:
Cook the butter and onion together in a saucepan. Add the flour and stir until thick. Add the chicken brother and take off of the heat. Add the sour cream and stir.

For the filling:
In a bowl mix 1 c. of the sauce, the chicken, chiles, chili powder, 1 c. of cheese together. Spoon the filling inside of the tortilla shells and roll up. Place rolled tortillas into a sprayed 9 x 13 pan. Pour the remaining sauce over the top of the enchiladas. Sprinkle the rest of the cheese onto the top of the enchiladas. Cover with tin foil. Bake at 350 degrees for 25-25 minutes. (Remove the tin foil for the last 5 minutes of baking)