Crust
1 1/4 cups unbleached all-purpose flour plus more for surface
1/2 cup (1 stick) chilled unsalted butter, cut into 1/2" cubes
1/2 teaspoon kosher salt
Filling and Topping
2/3 cup plus 3 tablespoons sugar
2 1/2 tablespoons cornstarch
1 teaspoon finely grated lemon zest plus 2 tablespoons fresh lemon juice
5 cups (1 pound 10 ounces) fresh blueberries
3/4 cup unbleached all-purpose flour
3 tablespoons (packed) light brown sugar
1/2 teaspoon cinnamon
1/4 teaspoon salt
5 tablespoons unsalted butter, melted, cooled slightly