I used to love tim tams and mint slice but find them too hard to eat now and you can't dunk them so I stick to plain biscuits I can dunk. I make Anzac biscuits mostly as everyone loves them and I can control my cooking of them to be soft or firm.
I love the Dutch Speculaas spiced biscuits which have the most incredible crunch to their cinnamon infused flavour!! I adored these as a child as well, and always called them 'Windmill' biscuits due to the image of the Dutch Windmill impressed into the shape and surface. Unfortunately, my Woolies stores no longer stock them, so I have to pay a higher price at IGA, or at my little corner store which has a marvellous range of European cookies!
I used to make lots of Biscuits when my son was little, and all of them were egg-free! Yum!!! They were all extremely crisp and crunchy. I also only ever used real butter as I like the flavour so much better than any other 'spread'