Step 1: Prepare the Berries

1. Preheat the oven to 350°F (175°C).
2. Lightly grease a 9×13-inch baking dish with a small amount of butter to prevent sticking.
3. Wash the berries thoroughly and pat them dry with a paper towel.
4. In a large bowl, toss the berries with ¼ cup flour, ¼ cup sugar, and a pinch of salt. This step helps absorb extra juices and ensures a thick, rich filling.
5. Transfer the berry mixture to the baking dish, spreading it out evenly.
6. Dot the berries with small pieces of butter for added richness.

Step 2: Pre-Bake the Berries

1. Place the baking dish in the oven and bake for 18 to 22 minutes, until the berries begin to bubble around the edges.
2. Remove from the oven and gently stir the mixture to distribute the juices.

Step 3: Prepare the Cobbler Topping

1. In a medium bowl, whisk together 1 cup flour, ½ cup sugar, 1 teaspoon baking powder, and ¼ teaspoon salt.
2. Melt ½ cup butter, then mix in 1 teaspoon vanilla extract.
3. Pour the melted butter mixture into the dry ingredients and stir until it forms a crumbly dough.

Step 4: Assemble and Bake

1. Sprinkle the cobbler topping evenly over the warm berries. Use your hands to create a slightly uneven texture for a rustic look.
2. Return the dish to the oven and bake for 20 to 25 minutes, or until the topping turns golden brown.
3. Remove from the oven and let the cobbler rest for 10 to 15 minutes before serving. This allows the filling to thicken slightly.