Crush digestive biscuits into fine crumbs and mix with melted butter.
Press the mixture firmly into a tart pan to form the base and refrigerate for 20–30 minutes to set.
Melt milk chocolate and combine with cream cheese and hazelnut spread until smooth and creamy.
Fold in whipped cream to create a light mousse-like filling.
Spread the filling evenly over the chilled biscuit base.
Melt additional chocolate and pour gently over the top for a glossy finish.
Chill for at least 3–4 hours until firm, then decorate with chopped Kinder Bueno pieces before serving.