Put the biscuits in a large zipped bag. Use a rolling pin to smash the biscuits into small pieces then transfer into a bowl.
In a saucepan, heat heavy cream and butter until the butter melts. Then turn off the heat and put the chocolate chips in the hot mixture, whisk until melts.
Pour the chocolate mixture over the biscuits, mix well until all the biscuits are coated with chocolate.
Transfer the mixture into a 20cm springform (lined with parchment paper) then refrigerate for 1-2 hours.
Next, take the cake out of the springform, sprinkle powdered sugar on the top then serve it with blueberries and raspberries.
Notes
Using semi-sweet chocolate makes it sweet enough that you will not need to add sugar to this recipe. However, if you like to use dark chocolate, you may need to add ¼ cup of sugar to the chocolate sauce.
You can top this no-bake cake with any fresh fruits you like.
You can sprinkle some cocoa powder on top of the cake instead of powdered sugar.