
Preheat the oven to 160ºC/325ºF and prepare a 9 inch springform tin.
Blend digestive crackers and sugar in a food processor; mix in melted butter.
Press and bake the crust for 10 minutes, then let cool.
Prepare blueberries with sugar, flour, and lemon juice.
Prepare crumble with flour, brown sugar, and melted butter.
Mix cream cheese, sugar, sour cream, cornstarch, and vanilla until smooth; add eggs.
Pour batter into crust, top with blueberries and crumble, and bake in a water bath.
Cool in the oven and then chill in the fridge for at least 6 hours.