Creating a scrumptious Blackberry Pie can be straightforward if you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 425°F (220°C).
2. Prepare the Blackberries: In a medium bowl, mix the blackberries, sugar, cornstarch, lemon juice, vanilla extract, and salt until well combined. Set aside to let the mixture marinate while you prepare the crust.
3. Prepare the Pie Crust: If using refrigerated pie crusts, unfold one crust and gently place it in a 9-inch pie pan. Press it against the sides and bottom of the pan without stretching it.
4. Fill the Pie: Pour the blackberry mixture into the prepared crust. Make sure to distribute it evenly for a balanced flavor.
5. Dot with Butter: Cut the tablespoon of butter into small pieces and sprinkle it over the blackberry filling for added richness.
6. Top with Second Crust: Unroll the second pie crust and place it over the filling. Trim any excess overhang, then crimp the edges to seal. Cut several slits in the top crust to allow steam to escape.
7. Prepare for Baking: If desired, you can whisk an egg and brush it over the crust for a golden finish. Sprinkle coarse sugar on top for added crunch and sweetness.
8. Bake the Pie: Place the pie in the preheated oven on a baking sheet (to catch any drips) and bake for 45-50 minutes or until the crust is golden brown and the filling is bubbly.
9. Cool the Pie: Once baked, remove the pie from the oven and let it cool for about 15-20 minutes before slicing. This cooling period will help set the filling for cleaner slices.
10. Serve: Slice the pie and serve it warm or at room temperature, paired perhaps with a scoop of ice cream or a dollop of whipped cream.