Start by cooking the chicken, pasta, and broccoli. Shred the chicken and set aside.
In a bowl, mix cream of mushroom soup and milk to create a creamy base.
In a casserole dish, layer cooked pasta, shredded chicken, and broccoli florets.
Pour the creamy mushroom soup mixture over the layers.
Sprinkle shredded cheddar cheese on top of the casserole.
Mix bread crumbs with a bit of melted butter and scatter them over the cheese.
Bake the casserole until it's bubbly and the cheese is melted.