Adapted from Betty Crocker
Heat oven to 350°F.
Melt butter in small baking dish.
Mix flour, sugar, salt, and baking powder together. Stir in milk and vanilla. Pour in melted butter and stir to blend. Pour back into baking dish. Sprinkle blackberries on top and press down slightly. Sprinkle with sugar and bake 45 to 50 minutes or until done.
Serve warm or at room temperature with whipped cream or ice cream. Or drizzle with a white chocolate cream sauce.