• Preheat oven to 375F

Making the Crust

• In a medium bowl whisk together the flour, sugar, and baking powder so that they are thoroughly combined
  
• Cut up the stick of butter into small cubes and incorporate into the dry mixture using a fork or your hands to create a crumbly mixture. then add Add in the egg until it resembles a crumbly dough
  
• Pat gently into your greased springform pan to create an even crust
  

Making the Filling

• Pour the blueberries over the crust in an even layer
  
• Mix together the sour cream, vanilla extract, sugar, and egg yolks
  
• Pour over the blueberries and create an even layer
  

Baking

• 375F for 60 minutes or until the edges are lightly browned
• Remove from the oven and let cool
• Use an offset spatula or a butter knife to loosen the edges from the sides