Preheat oven to 350 degrees.
Cook pasta according to directions on package. Drain.
In a greased casserole dish, combine chicken, pasta, broccoli, corn, soup, cheese and milk. Season with salt and pepper, if desired.
In a small bowl, stir saltines and butter. Sprinkle on top of pasta mixture.
Bake for 30-40 minutes or until crumbs are golden brown.