Preheat oven to 350 degrees.

Butter baking dish.

Pour the flour and 1 cup sugar in a large mixing bowl. Use a whisk to combine the flour and sugar.

Add the milk to the flour and sugar. Stir with whisk until combined.

Add the melted butter to the mixture. Stir with whisk until completely combined.

Pour the batter into the prepared dish.

Sprinkle the blackberries evenly over the top of the batter.

Sprinkle 1/4 cup sugar over the batter and blackberries.

Bake in the oven for 1 hour. Sprinkle 1 t of sugar over top 10 minutes before the cobble is done.

Remove from the oven, and let cool for at least 15 minutes.

Serve with whipped cream or vanilla ice cream.