Preheat oven to 400 degrees. Gather your ingredients so that you have everything close at hand on the counter or table. Rinse and drain the fresh blackberries.
In small bowl, combine blackberries, granulated sugar, and freshly ground nutmeg. Carefully mix until sugar dissolves and makes its own juice.
In a medium bowl, combine the all-purpose flour, granulated sugar, baking powder, and salt. With a blending fork, cut in butter. Add the large egg and whole milk. Stir together until moistened.
Pour the blackberries into a greased baking dish. Add dots of butter over fruit. Spoon biscuit mixture over fruit in mounds, spreading to edges. Sprinkle with sugar.
Bake in preheated oven for 25-30 minutes until edges are golden brown and topping is cooked through. Serves 6-8.
Notes
*Unless otherwise indicated all butter on this recipe site is salted.