Blackberry Cobbler

3 cups fresh or frozen blackberries 1 cup sugar 1/4 tsp ground cinnamon 3 Tablespoons cornstarch 1 cup cold water 1 Tablespoon butter Biscuit topping 1 1/2 cups flour 1 Tablespoon sugar 1 1/2 teaspoons baking powder 1/2 teaspoon salt 1/2 cup cold butter 1/2 cup milk In a large saucepan, combine the blackberries, sugar and cinnamon. Cook and sit until mixture comes to a boil. Combine the cornstarch and water until smooth. Stir into fruit mixture. Bring to a boil, cook and stir for 2 minutes until thickened. Place in a greased baking dish. Dot with butter. For topping, combine the flour, sugar, baking powder and salt. Cut in butter until mixture resembles coars crumbs. Stir in milk, just until moistened. Drop by tablespoonfuls onto hot berry mixture. Bale uncovered at 350 degrees for 30 - 35 minutes or until topping is golden brown. Remove from oven and spoon into bowls then top with whipped cream or ice cream.