I know everyone says treats, but I can’t really find things they like!
Same!!!
Maybe take some of their usual chick starter, and get it wet with water.
I've found that chickens of all ages seem to like it that way.
I've had chicks eat it from a dish or from my fingers, and the same with older chickens.
They will usually come running if they see me coming with the dish, and crowd around to gobble this great "treat."