*Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
**Nutrient information is not available for all ingredients. Amount is based on available nutrient data.
(-)Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.
Preheat the oven to 375 degrees F (190 degrees C). Grease a 9-inch square baking dish.
Mix flour, baking powder, and salt in a bowl; set aside. Beat 1/2 cup white sugar and butter in another bowl until smooth. Stir flour mixture alternately with milk, into butter mixture until well mixed. Pour batter into prepared baking dish. Spoon blackberries and blackberry juice on top and sprinkle with remaining 1/2 cup sugar.
Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 45 minutes.