Prepare the pie dough at least 2 hours before baking and chill it in the refrigerator.

In a large mixing bowl, combine the blueberries, granulated sugar, flour, cornstarch, cinnamon, lemon juice, and lemon zest.

Pour the blueberry filling into the prepared crust and dot with cubes of cold unsalted butter. Roll out the second dough disc and cover the filling.

Preheat your oven to 425°F (218°C) and bake the pie for 25 minutes. Lower the temperature to 375°F (190°C), cover the edges, and continue baking for 45-55 minutes.

Let the pie cool completely at room temperature for at least 4 hours before slicing.