Preheat the oven to 350℉. Grease a 2 quart baking dish.
In a large bowl, whisk the granulated sugar, flour, baking powder, and salt.
1 cup granulated sugar, 1 cup all-purpose flour, 1½ teaspoons baking powder, ½ teaspoon salt
Add in the milk and melted butter. Whisk to combine.
1 cup whole milk, ½ cup butter
Pour the batter into your prepared baking dish.
Evenly scatter the blackberries over the batter. Sprinkle the top with coarse sugar
16 ounces blackberries, 2 tablespoons coarse sugar
Bake for 55-60 minutes, or until the batter is set and the top is golden brown. Let cool for 5-10 minutes and serve.