preheat oven to 180 deg celciusCream butter and sugar. Beat in eggs. Add in the cocoa,hot chocolate,coffee and cornflour. Sift baking powder and flour. Make a soft dough with cake flour , being careful to add bit by bit as the dough should be soft . Roll and cut into ovals. Bake for approx 10 to 15 minutes. When cool sandwitch the cookies with chocolate .