Well this is the first time i have done it so i just guessed. I melted the marshmallows in the microwave and then added the rice bubbles until it had a pretty good covering and then let it cool. I sprayed my hands with cooking oil so it didnt stick and then moulded it. I hope this helps but if you have trouble you could always look up rice crispy treats recipe on the internet..they might have the exact amount :)
Susan, Adelaide, www.facebook.com/wwwcakes
