Preheat oven to 325°F and wrap a springform pan with foil.
Mix crust ingredients, press into pan, and bake 10 minutes. Cool.
Beat cream cheese and sugar until smooth. Add sour cream, vanilla, flour, then eggs one by one on low speed.
Toss blueberries with a little sugar, lemon, and flour. Mix crumble ingredients with cold butter until crumbly.
Pour batter over crust, top with berries, then sprinkle with crumble.
Bake in a water bath for 70-80 minutes until set but jiggly in center. Cool in turned-off oven for 1 hour.
Chill in fridge for at least 6 hours before serving.