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Line eight holes of a 12-hole cupcake tin with paper cases. Tip the cookies into a food processor and blitz to a fine crumb, or do this in a bowl using the end of a rolling pin. Measure 215g of the crumbs into a bowl and mix in the melted butter. Divide the mixture between the paper cases, pressing it into the bases slightly.
Pour the cream, condensed milk and 55g of the remaining crushed cookies into a bowl, and whisk until just starting to thicken, about 5 mins. Spoon the mixture evenly over the chocolate cookie bases, then freeze for at least 2 hrs or overnight until solid. Will keep frozen for up to two days.
Just before serving, make the topping. Whip the cream with the icing sugar using an electric whisk until it’s a pipeable consistency. Spoon into a piping bag fitted with a star nozzle and pipe a swirl of whipped cream over each cupcake. Decorate each with a whole cookie and remaining cookie crumbs. Serve immediately.