Cook chicken in boiling water until done (about 20 minutes).
Cut into bite size pieces. preheat oven to 350 degrees.
Grease 9 x 12 baking dish.
Mix together soup, sour cream, and broth.
Put chicken in a layer in baking dish.
Pour mixture over chicken evenly.
Crush crackers (course crumbs).
Sprinkle crumbs in a layer over sour cream mixture.
Drizzle melted margarine evenly over crumbs.
Bake at 350° for 45 minutes.
Serve hot over egg noodles with a green vegetable or salad.