Why the downvote on @michael's correction of the method name? The documentation is clear:
//Recipients
$mail->setFrom('[email protected]', 'Mailer');
$mail->addAddress('[email protected]', 'Joe User'); //Add a recipient
$mail->addAddress('[email protected]'); //Name is optional
$mail->addReplyTo('[email protected]', 'Information');
$mail->addCC('[email protected]');
$mail->addBCC('[email protected]');
Lowercase 'addCC', not upper 'AddCC'