Preheat your oven to 350°. Cut your stick of butter into cubes to melt easier, place in oven for a few minutes to melt. Keep an eye on it making sure not to burn.
Add your sugar, flour, baking powder, salt and milk to a bowl and stir. Don't over stir, a few small lumps are fine!
Pour into 9x9 baking dish that already has melted butte and give it a little stir. Add your blackberries to the top making sure to spread out evenly.
Bake for 40-50 minutes or until a toothpick inserted comes out clean (with no batter on it). Let rest for 5-10 minutes before cutting and top with a little raw sugar, enjoy!