125 g butter
200 g of powdered sugar
350 g biscuits - cocoa
chocolate bars and another of your choice to decorate
Photo added on
Smash biscuits of very small (made of dust). I personally in a pouch and top with rolling pin mash them and get a lot better. Add powdered sugar. Melting the butter in the microwave (or low heat) and add it to the biscuit powder. Everything is kneaded to a sticky mixture, which can get a little pellets. You may need to further crushed biscuits or add more butter. It is very important when shape marbles them immediately and dirty in the decoration, as if you leave them a little to stay cool and the butter will stick better.