golden eggs

Noun

golden egg (plural golden eggs)

1. A source of consistent profit or advantage, or the profit gained by such advantage.
   • Here’s golden eggs in plenty, why not the Golden Age? —
     The time the world is waiting, the day-dream of the sage;
     […]
     The golden eggs of Eight-Seven, after four years’ incubation,
     Should hatch a brood to scratch the good from out the whole creation,1887, Oliver Huckel, “The New Mother Goose”, in The Record. ’87, University of Pennsylvania, page 55
2. Used other than figuratively or idiomatically: see golden, egg.