Preheat the oven to 300oF and grease a spring-form cake pan with butter.
Break vanilla wafers & cookies into a food processor and process until finely crushed. Add melted butter and mix well. Evenly spread mixture into the pan.
FOR THE CHEESE CAKE
Combine sugar, cornflour and cream cheese in a bowl using an electric beater. Beat until smooth.
Add sour cream and beat until fully incorporated.
Beat in the eggs one at a time. Add thickened cream and mix well.
Strain mixture, and pour into the pan.
Bake in a water bath at 300oC for 40 mins.
Turn off the oven, and leaving the door slightly ajar, allow the cake to continue cooking. At least 40 minutes.
Remove from oven & allow to completely cool.
Refrigerate for at least 4 hours before serving.
FOR THE MARZIPAN PUMPKIN
Mix all of the ingredients together until smooth and the desired color has been reached.
Divide the mixture evenly and form into pumpkin shapes.
Garnish (like a pumpkin stem) with a clove on top.