Use a 8" round pie pan or square baking dish. Spray lightly with non stick spray. Preheat oven to 350 F.
Put fruit into a bowl and gently toss with 1/2 cup of your sugar, set aside for 20 minutes to sit and absorb the sweetness. Melt butter in the microwave and pour into your dish.
In another bowl whisk together Bisquick, rest of sugar and milk until smooth. Pour into baking dish on top of the butter layer. Pour blackberry sugar mixture on top of that.
Bake for 55 minutes or until top is a golden brown.
Scoop into bowls and top with whipped cream or vanilla ice cream.