Line an 8x8-inch tin with baking paper.
Crush the biscuits into fine crumbs using a food processor or high-powered blender.
Add the crumbs to a bowl with the melted butter and mix well. Press evenly into your lined tin.
Melt the milk chocolate and set aside to cool slightly, about 5 minutes.
Mix the cream cheese and icing sugar together in a large bowl. Then stir in the melted chocolate.
Add the double cream and use an electric whisk to mix briefly. Do not overmix- stop whisking as soon as the mixture becomes thick.
Spoon the filling over the biscuit base in the tin and spread it out evenly.
Top with bourbon halves and crumbs then set in the fridge overnight to set, or for at least 6 hours.
Once set, remove from the tin, cut into bars and enjoy!