Preheat the oven to 350°F (175°C). In a mixing bowl, combine the berries, sugar, and lemon juice. Stir gently to mix.

In another bowl, whisk together the flour, sugar, baking powder, and salt. Add the milk, melted butter, and vanilla extract. Mix until just combined.

Pour the fruit mixture into a greased baking dish. Spoon the cobbler topping over the fruit evenly.

Bake in the preheated oven for 30-35 minutes, or until the topping is golden brown and a toothpick inserted comes out clean.

Let cool slightly before serving. Enjoy warm with ice cream or whipped cream if desired.