First of all add the biscuits to the blender (break them up if necessary). Then blend them well until you get a fine crumble and pour in the melted butter.
Stir well. Pour the chocolate batter on top of the baked cookie bottom in the springform pan.
Spread the chocolate batter evenly. Bake the cake in the hot oven at 338°F (170°C) for 50 to 60 minutes. Remove the cake from the oven. Then let it cool completely in the springform pan. Sprinkle with a little icing sugar and serve.