Chicken a la King is an easy and delicious weeknight dinner filled with tender cooked chicken, green bell pepper, mushrooms, and pimentos in a mouth-watering cream sauce. It is traditionally served over rice, egg noodles, toast, flakey biscuits, or puff pastry shells, and can be substituted for canned tuna if you're craving something different.
Melt butter in a skillet and add onions and green bell pepper. Stir as needed to prevent burning. Cook mushrooms and bell pepper until tender, 5-8 minutes.
Add flour, mustard powder, black pepper, and salt to create a thick paste of vegetables.
Stir in chicken broth, heavy cream, and simmer for 3-5 minutes to thicken sauce.
Stir in chicken, frozen peas, and pimentos and simmer for 10 minutes. Serve over rice, egg noodles, or mashed potatoes, or with cooked biscuits.