My hens get most of our leftovers. Almost all vegetable trimmings and leftovers except potato peels from making and eating dinner, bread/cracker/pasta leftovers, leavings from my son's lunches (note: peanut butter from leftover pb&j sandwiches CAN glue a hen's beak closed, and she won't sit still for it to be wiped off. Learned that one the hard way, so now they only get the jelly side of the sandwiches), pie crusts, fruit from the 'fridge that we won't eat but isn't spoiled, even the bread from restaurant bread baskets (hey, I paid for it!), and pizza crusts. If its edible and won't harm them, they get it.
They don't get it all at once, though. I keep an aluminum pie tin from store-bought pie crusts (all those fresh eggs make great quiche!) on the counter throughout the day and toss in whatever isn't eaten or used. Every morning the tin gets taken out to the coop. I retrieve it in the evening after work and throw it in the dishwasher. It sounds like they get a ton of leftovers, but they don't really. In the summer they get all the weeds and garden trimmings they can eat. Feeding chickens leftovers that would be otherwise discarded is another type of recycling, with the added benefit of excellent eggs.
