Make the Oreo base

• Blitz the Oreo cookies in a food processor until fine crumbs form.
• Mix the crumbs with the melted vegan butter until evenly coated.
• Press the mixture firmly into the lined baking dish and chill while you make the filling.

Whip the cheesecake filling

• Beat the vegan cream cheese with the icing sugar until smooth.
• Whip the chilled vegan cream until thick and fold it into the cream cheese mixture.
• Add the mint extract and a little green food colouring and mix until evenly coloured.

Assemble and chill

• Spread the mint cheesecake mixture over the chilled Oreo base in an even layer.
• Smooth the top with a spatula and refrigerate until firm.

Top with chocolate

• Melt the dark chocolate and pour it over the set cheesecake.
• Spread it into an even layer and chill until the chocolate has set.

Decorate and serve

• Cut the slab into bars.
• Decorate each bar with candy eyes to make Frankenstein faces.