"dried fruits and nuts" is likely to be a problem (confiscated). Food processed and packaged by a manufacturer is generally OK. But do not rely on what I write: I am not the Au government. "granola type bars" are for sale in Australia.
But you need to do a lot more research
https://www.border.gov.au/Trav/Ente/Brin
http://www.agriculture.gov.au/travel...g-in-australia
http://www.australia.gov.au/informat...and-quarantine
https://www.lonelyplanet.com/thorntr...into-australia
http://www.fodors.com/community/aust...-australia.cfm