Combine chicken, noodles, sour cream, soup and cheeses in a
large bowl. Pour into a lightly greased 13"x9" baking dish. Mix together
cracker crumbs and margarine; sprinkle over top. Sprinkle poppy seed
over cracker crumbs. Bake at 350 degrees for 25 to 30 minutes or until
crackers are crispy and golden and cheese is melted.