I just use the cut off tops off large plastic fruit juice barrels.
When I filled them full (my hens free-reange by the way), they would scratch it all over, and the waste was more than they were eating, and because the food was there, they didn't need to go out and bug hunt.
I now limit the food I put in, in the morning, yes they get in there and scratch around, but that's what chickens do, but no food ios wasted, and they go out and bug hunt. In the evening they get more food, and they eat all that, maybe a little left over.
Just what I do, it works for me.