Here are some things you could also do
"Your chickens can eat cheese, plain yogurt, sunflower seeds, or cooked beans as a protein source. Chickens also enjoy eggs, but only serve them cooked so they do not start wanting to eat their own freshly laid eggs" (I just looked it up that probably doesn't help)
"Yes, chickens can eat a small amount of cat food. Cats need a lot more protein in their diets, so long-term it'll be bad for chicks. A short-term protein boost can help with molting and egg production though." (used google again)