Preheat over to 350 degrees and put your 10" skillet in the oven while it heats up.
In a medium bowl, whisk 1 cup sugar, flour, and milk. Whisk in the melted butter
If you are using fresh berries, wash and pat dry. Pour the batter into the hot skillet. Sprinkle the berries evenly over the batter. Sprinkle 1/4 cup of sugar over the blackberries. Sometimes I add a bit more sugar depending on the sweetness of the berries. Bake for about 1 hour until golden brown and bubbly.
Sprinkle a couple to teaspoons of sugar on the top of the cobbler after bringing out of the oven.
Top with whipped cream or your favorite ice cream.