As long as they are cooked they will not know its egg LOL! If you feed them shells, crush them up ...pulverize them (after drying them very well) The entire egg is good for them.
I feed my chickens leftover eggs (sometimes there are some LOL) with the shells scrambled in too........good calcium and protein...and even toss in leftovers or yogurt as filler and they've never eaten raw eggs....I've had them for 4 plus years now.