This is how mom makes Chicken a la King -- one of dad's favorite dishes (this along with Chicken Velvet Soup, basically the same idea).
1/4 C butter (can use 1/8 C canola oil + 1/8 C butter)
1/3 C fresh mushrooms or 2 oz can
1/4 C chopped green bell pepper
1/4 C chopped pimento/red pepper
1/4 C flour
1/2 t salt
1/8 t pepper
1 C chicken broth
1 C milk
1 C diced, cooked chicken
Saute fresh mushrooms and peppers in the butter (if using canned mushrooms and bottled pimentos, you can add those when you add the chicken, just saute fresh green bell pepper). Blend in the flour and seasonings. Cook on low until smooth and bubbly. Stir in broth and milk. Boil over low for one minute stirring constantly. Add chicken. Cook until heated through. Serve over potatoes, rice, toast, or noodles.