You will need silicon chocolate moulds - obtainable from Lakeland and elsewhere
Method
Melt the butter in a saucepan on a gentle heat. Add the chocolate powder and icing sugar and stir with a wooden spoon until molten. Remove from the heat.
Add the cream and brandy and beat until well mixed. Pour into a jug, then pour the mixture into the chocolate moulds.
Leave to set in the fridge for at least two hours. Pop out of the mould and roll in chocolate powder.
Another suggestion
Only half fill the chocolate mould with truffle mixture and allow to set.
Melt some Mortimer Chocolate White Couverture Powder and cover the set truffle. Put back in the fridge for the white chocolate to set. When the truffle is turned out, it is an attractive two-tone chocolate.