Apple peel is the skin which covers the flesh of an apple.
It is either left on the apple or peeled off, depending on the taste of the person eating the apple.
Apple peel is completely edible and won’t harm a human when it is eaten.
Apple peel is also home to ursolic acid, which is an important compound in the obesity-fighting ability of apples. (source)
So can chinchillas eat apple peels?
Yes apple peels are fine for them to eat, they won’t do them any harm.
However, don’t feed them too much as they may get stomach ache from too much.