Step 1

Preheat oven to 375F

Step 2

In a medium bowl whisk together the flour, sugar, and baking powder so that they are thoroughly combined

Step 3

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

Step 4

Pat gently into your greased springform pan to create an even crust

Step 5

Pour the blueberries over the crust in an even layer

Step 6

Mix together the sour cream, vanilla extract, sugar, and egg yolks

Step 7

Pour over the blueberries and create an even layer

Step 8

375F for 60 minutes or until the edges are lightly browned

Step 9

Remove from the oven and let cool

Step 10

Use an offset spatula or a butter knife to loosen the edges from the sides