High protein treats??

[chicken farmer]

I'm wanting to help fatten up my cornish cross meat chickens and wanting to know what treats/food are high in protein. I know eggs and yogurt is some what high in protein. But would like to here more treats high in protein

 

[Chick Charm]

Mealworms. A little on the speedy side for meaties but it helps.

Maggots. Red worms or night crawlers.