Preheat oven to 400 degrees. Prepare cookie sheet with wax paper and flour, or flour pizza stone.
Roll out pie crust onto flour until it's approximately 1/8" thick.
In a separate bowl combine blueberries, lemon juice, lemon zest, flour, and cinnamon.
Spoon blueberry filling to center of pie crust, leaving 2" around the perimeter.
Fold over perimeter, pressing to seal at corners.
Brush perimeter generously with egg wash.
Garnish egg wash with coarse sugar.
Bake for 20 minutes, or until crust is crispy and golden.
Slice pizza-style and serve a la mode and/or with a dollop of whipped cream.