Perhaps a little bit retro, this one-dish chicken macaroni casserole is pure comfort food in a pan. Chicken and pasta combine with peas and pimentos in a simple sauce made with cream of chicken soup and milk. The pimientos add some color and depth of flavor to the sauce mixture, and a buttery crumb crust finishes this casserole perfectly. The shredded cheese is optional but adds a creamy texture and a nice taste. You can also add other vegetables to this casseroletry mushrooms, bell peppers, broccoli, and even corn.