Preheat oven to 350°F (180°C).
In a large bowl, gently toss berries with butter and lemon juice. In a small bowl, combine brown sugar and 2 Tablespoons of flour. Gently stir into berry mixture.
Pour berries into the bottom of a greased 8-inch x 8-inch baking pan.
In a separate bowl, whisk together the granulated sugar, ¾ cup flour, salt, baking powder, and milk. Pour the batter over top of the fruit.
Bake for approximately 45 minutes, or until golden brown and firm.
