Actually, some soft cooked egg, chopped into small pieces, w/ a dab of yogurt (active culture) is the FIRST food they get,
then in the 2nd -4th feeding I sprinkle the crumbles on there so they get the idea that the dry crumbles are good food.
If they show a lack of figuring out the crumbles I repeat w/ less egg, more crumbles until they will go eat just crumbles on their own.
If they show any sign of "pasty butt" then more "meals" w/ either just the liquid from the yogurt container drizzled over it, or a dab of the yogurt itself.
I try to stop giving egg after the first 1-3 days, unless I see any sign of lack of eating or other stress then they get some soft cooked egg treat.
For example when I moved huge fully feathered NYDH chicks to the outdoor brooder (w/ heat lamp but not like being indoors) & the night temps made me
a little concerned I took them some soft cooked egg treat just at dusk, they gobbled it up & that way I was totally certain they had a good meal prior to their first cold night.
That is all just me, everyone does things diff. much depends on breed, weather, indoor vs outside etc.
(for example in summer I don't leave egg sitting around more than a few. min.)