Do you have Chocolate Wheaten biscuits in Aus?
http://www.griffins.co.nz/by-name/wheaten
If you do or have a similar biscuit, take two of them and put them together with a marshmallow in between. The chocolate sides of the biscuit should be in the interior of the "marshmallow sandwich". Then put it in the microwave and cook it until you see the marshmallow start to grow. It will grow enormous so just take it out when you are confident it has melted enough to create a "smore" As we don't have Graham crackers here in NZ, that's the Kiwi version of a smore!