Eggs are eggs, no matter how you cook them. But new baby chicks' beaks are so tiny and weak, the material they are able to process needs to be very fine.
Therefore, cook the egg in whatever manner you choose, and then run it through a food processor or blender to make the particles finely minced. The chicks will be able to get very enthusiastic over this.
Finely minced boiled egg is the first food I feed all my newly hatched chicks to get them started eating.