Preheat oven to 350 degrees F.
Into a buttered shallow baking dish place blackberries. Sprinkle with 1/3 cup sugar.
In the bowl of a food processor combine flour baking powder and salt. Add butter and pulse to create lumpy mixture. Add cream and pulse until dough forms. Dough will be soft. Spoon dough over blackberries.
Melt remaining 2 tablespoons butter and drizzle over mounds of dough. Sprinkle with remaining 1/3 cup sugar.
Bake about 30 to 40 minutes or until dough and fruit are cooked through and dough is lightly browned.
Serve with whipped sweetened cream.
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