In a small bowl whisk the condensed milk & vanilla and set aside

Pour the whipped cream in to a large bowl & whisk the cream for 3mins,on high speed using an electric mixer/whisk,beat the cream until it forms a stiff peak

Now combine the whipped cream & the condensed milk together,mix well and pour in to a container,cover and store in freezer for at least 6-8 hours or until it firm