Get the dough from the refrigerator.
Use the rolling pin to shape flatten the dough, then divide it into two.
Brush the baking dish with a bit of oil.
Flatten the dough using a rolling pin, and the size of it should fit on the baking dish.
Now arrange the dough into the baking dish, then pour the blackberry mixture into the dough.
Make the cover of your pie from the remaining dough, flatten it using the rolling pin then put it on top of the pie.
Bake it for 25 minutes. After 25 minutes, sprinkle it with a bit of sugar on top (optional).
Remove the baking dish from the oven and let it cool for 10 minutes.
After 10 minutes, take a slice. Serve and enjoy!