Melt the milk chocolate in a heat proof bowl over a pan of simmering water.
In another bowl, add the tin of condensed milk, cocoa powder, and vanilla essence. Use an electric whisk to beat it until smooth.
Pour the melted chocolate into the bowl and fold it through until it is well combined.
In a separate bowl, whip the double cream until it reaches stiff peaks. Beat the cream into the chocolate mixture.
Smash up the Oreo biscuits into small pieces. Add them into the bowl and fold it through.
Pour the mixture into a tin or a container that can go into the freezer.
Crush the Oreos for the top into small pieces and scatter them over.
Place it into the freezer for a minimum of 4 hours but ideally overnight.
Once frozen it is ready to scoop and enjoy!