• 40g dark cooking chocolate
• 125g butter, softened
• 1/3 cup pure icing sugar, sifted
• 1 tsp vanilla extract or brandy
• 1 1⁄4 cups plain flour
• 1⁄4 cup cornflour
• Extra flour, for kneading
• Extra 1 Tbsp icing sugar
• 2 tsp cocoa
Preheat oven to 160°C. Line an oven tray with baking paper. Put chocolate in a heatproof bowl over a saucepan of simmering water, stirring occasionally, until melted. Set aside to cool.
Put butter, icing sugar and vanilla in the bowl of an electric mixer and beat until light and creamy. Stir cooled chocolate into butter mixture.
Sift flour over chocolate mixture and stir until a soft dough forms. Turn out dough onto a lightly floured surface and knead until smooth.
Roll out dough between 2 sheets of baking paper to 5mm thick. Using a 7cm round biscuit cutter, cut out rounds from dough. Press remaining dough together, re-roll and cut out to make a total of 12 rounds. Use a skewer to make a hole in top of each round. Transfer to prepared tray.