Blend butter and flour and add to broth. Stir until thick and cook slowly. Add beaten eggs very slowly to broth. Cook at low heat for 2 minutes. Add chicken, cut into pieces. Grease large casserole dish or dipper. Place dressing in bottom. Pour custard and chicken mixture over dressing and top with remaining bread crumbs which have been rolled fine. Bake 30 minutes at 300 degrees F.