01 - Place the chocolate cookies in a food processor and pulse until finely ground into uniform crumbs.
02 - If using, add granulated sugar to the crumbs and pulse briefly to combine evenly.
03 - Transfer crumbs to a mixing bowl, pour in melted butter, and mix thoroughly until the crumbs are evenly moistened and have a wet sand consistency.
04 - Use immediately as a base or topping. For crusts, press the mixture firmly into the pan bottom.