Ritzy Chicken Casserole Recipe - The Spruce Eats 14.07.2021 · To make it more colorful and nutritious, feel free to add other ingredients such as pimientos or 1 to 1 1/2 cups of lightly steamed frozen peas, green beans, or mixed vegetables to the chicken and sauce mixture. Steamed asparagus or broccoli are good options as well.; Add a few tablespoons of chopped fresh parsley to the filling for color.