Preheat oven to 180° C. Grind broken chocolate cookies in a mixer jar. In a bowl mix together ground chocolate cookies and butter. Spread this mixture evenly in a cake tin with wet hands. Bake in a preheated oven for 10 minutes.
Put cream cheese in a bowl and whisk well. Add castor sugar and mix. Break the eggs into the mixture and mix well. Add cream and mix well. Remove the cake tin from the oven and spread the cheese cake mixture over it. Add blueberries and spread them over it. Bake for 40 minutes. Cool and serve.