Delicious Blueberry Pie

1 Prepare the crust. Roll out half of the dough to 1/8-inch-thick circle on a lightly floured work surface, about 13 inches in diameter. Fit the dough over a 9-inch pie pan, and trim the edges to a 1/2 inch over the edge all around the pan. Put into the refrigerator to chill for about 30 minutes.
2 Gently mix the blueberries, sugar, flour, cinnamon, lemon zest, and lemon juice in a large bowl. Transfer them to the chilled bottom crust of the pie pan. Dot with butter pieces. Roll out remaining dough to the same size and thickness as the first. Place on top of the berry filling. Tuck the top dough over and under the edge of the bottom dough, and crimp the edges with your fingers. Transfer the pie to the refrigerator to chill until the dough is firm, about 30 minutes. Heat oven to 425u0b0F.
3 Whisk egg and milk together to make an egg wash.
4 Remove the unbaked pie from refrigerator. Brush the top with egg wash. Score the pie on the top with 4 cuts (so steam can escape while cooking). Place the pie on the middle rack of the oven with a parchment paper or Silpat lined baking pan positioned on the lower rack to catch any filling that may bubble over. Bake for 20 minutes at 425u0b0. Reduce heat to 350u0b0F and bake for 30 to 40 minutes more or until juices are bubbling and have thickened. Transfer to a wire rack to cool. Let cool completely before serving.