Preheat over to 375 degrees. Cook broccoli as directed on package and drain. Arrange broccoli in the bottom of a greased 9-inch baking dish. Lay chicken slices on top. In a small mixing bowl, combine soup, mayonnaise and lemon juice. Pour over chicken slices. Combine bread crumbs and butter, sprinkle on top. Bake uncovered at 375 degrees for 20 to 30 minutes.