Crush the biscuits into fine crumbs and mix with the melted butter.
Press the mixture firmly into a lined 20cm springform tin and chill for 30 minutes.
Beat the cream cheese, icing sugar, peppermint extract, and vanilla until smooth.
Whip the double cream to soft peaks and gently fold it into the cream cheese mixture.
Fold in the chopped Mint Aero chocolate and optional green food colouring.
Spoon the filling over the chilled biscuit base and smooth the top.
Refrigerate for at least 6 hours, preferably overnight.
Remove from the tin and decorate with whipped cream, Mint Aero pieces, chocolate drizzle, chocolate curls, and fresh mint leaves before serving.