Step 1

Preheat oven to 350°F. Coat a 8×12 baking dish liberally with non-stick spray. Set aside.

Step 2

Rinse blackberries and pat dry. Set aside.

Step 3

In a large bowl whisk together 1 cup of granulated sugar, flour, milk, and vanilla until smooth. Then whisk in the butter until combined.

Step 4

Pour the batter into the prepared pan. Add the blackberries evenly on top of the batter. Sprinkle with the remaining 1/4 cup of granulated sugar.

Step 5

Bake for 55-60 minutes until the top is golden and crackly.

Step 6

Allow to cool slightly and serve warm with ice cream if desired.