I use the left over roast chicken for soup too. I also have used it to make chicken & dumplings. If I cut up something like an onion & have too much I also freeze it. Many times I’ve run out of fresh onions & that little baggie of onions has saved the dinner.
Whenever we roast a duck I always save the carcass to make duck and dumplings —— we call it Bis-Quack.