Absolutly, my relatives do it all the time. They even feed them turkey, mashed potatoes, and bread.
Absolutely
OF course you can give chickens many things we eat from fruits to veggies to meats and dairy products they enjoy all kinds of foods. But be sure to either dicsit, chop it slice it mince it since they have no teeth to chew it and be sure to wash all fresh veggies and fruits well before offering to your birds bread is no good for the birds but if offer it do so in little sections Not much.
i have been feeding my chickens my left over Vegetables is that ok. mostly the greens and some herbs