Try doubling this recipe and freezing half. Roll into balls ready to put straight in the oven at a later date. These will cook from frozen, just add 5 minutes to your cooking time.
Preheat an oven to 170C. Line two baking trays with paper.
Beat the butter and sugar until light and creamy. Sift in the flour and cocoa, combining well, then stir through the chocolate.
Roll the mixture into balls, around a heaped tablespoon each. Press the top lightly with a fork. Place into the oven for 15-18 minutes. Cool on the tray then move toawire rack. Store in an airtight container.
When ready to fill, sandwich two together with slightly softened icecream. Serve with warm chocolate sauce.