Preheat oven to 375°F (190°C).
Making the Crust:
In a medium bowl, whisk together flour, sugar, and baking powder.
Cut butter into small cubes and blend into the flour mixture using a fork, until crumbly.
Mix in the egg to form a dough.
Press the dough evenly into a greased springform pan.
Making the Filling:
Evenly spread blueberries over the crust.
In a separate bowl, mix sour cream, sugar, egg yolks, and vanilla extract.
Pour this mixture over the blueberries.
Baking:
Bake for 60 minutes or until edges are lightly browned.
Let cool before removing from the pan.