• Preheat the oven to 350℉ (180℃)

Blueberry filling

• Defrost and drain frozen blueberries. Reserve 4 fluid ounces (½ cup) of juice.
  1 ½ Pounds Frozen Blueberries, defrosted and drained
• Add cornstarch to a small bowl and dissolve by whisking in 3 fluid ounces of cold water.
  3 Tablespoons Corn Starch, 3 Fluid Ounces Cold Water (for dissolving corn starch)
• In a small bowl combine sugar, cinnamon and salt.
  1 teaspoon Ground cinnamon, ⅔ cup Granulated Sugar, 1 teaspooon Salt
• Place granulated sugar into a medium-sized saucepan.
  5 Tablespoons Granulated Sugar
• Pour blueberry juice into saucepan with granulated sugar. Heat on medium-high heat, stirring occasionally until it begins boiling.
  ½ Cup Blueberry juice (reserved from defrosted blueberries)
• Lower the heat to medium. Add the cornstarch/water mixture to the pan and stir constantly until thick.
• Add the sugar/cinnamon/salt to the pan and stir until the sugar is melted.
• Remove pan from heat and let the slurry cool briefly.
• Pour slurry over blueberries and fold until all the berries are coated.

Crumble Topping

• Combine brown sugar, flour, oatmeal, butter and ground cinnamon in a bowl. Using your hands or a stand mixer fitted with the paddle attachment combine ingredients until it resembles coarse pieces.
  ¾ cup Light or dark brown sugar, ¾ cup Oatmeal, ¾ cup All-purpose flour, ½ cup Unsalted butter, room temperature, 1 teaspoon Ground cinnamon

Assembling the pie

• Pour the blueberry filling into a pie pan lined with the dough of your choice. Evenly distribute the filling using an offset spatula.
  1 Batch Pie dough
• Sprinkle the crumble topping over the blueberry filling. Press lightly to create a mound of topping in the center of the pie.

Baking the Pie

• Place the pie on a cookie sheet or pie drip catcher and bake for 30 minutes. Check the pie after 20 minutes. If the crust is turning too dark, place a pie shield over the outer crust or wrap loosely in foil. Return to oven to finish baking for full 30 minutes.
• Remove from oven, place on a cooling rack and allow to cool completely before serving.