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.
Healthy chocolate brownies
Heat the oven to 190C/170C fan/gas 5 and line a shallow 23cm square baking tin with baking parchment. Tip the beans, cocoa, coffee granules, xylitol, vanilla, eggs and yogurt into a large bowl. Blitz using a hand blender until smooth. Or, do this in a food processor. Add the baking powder, then blitz again.