Place your pie dough into a 9" pie pan and prick the dough several times with a fork. Bake for 9-10 minutes or until the edges are lightly golden brown. Remove from oven, reduce heat to 350 degrees F.
For the Cake:
In a medium bowl whisk together the sugar, flour, sour cream, eggs and vanilla until smooth. Gently fold in the blueberries. Pour into the pie shell.
For the Crumble:
In a medium bowl combine the melted butter, brown sugar, flour and oats. Mix until combined, sprinkle evenly over the cake mix.
Bake for 55-60 minutes or until toothpick inserted in center comes out clean.*
Let cool on wire rack. Serve slightly warm with a scoop of vanilla ice cream! Enjoy!
Notes
*if your pie crust is browning too much, cover the edges with aluminum foil and continue to bake until toothpick inserted in center comes away clean.