Southern Blackberry Cobbler

Name: Southern Blackberry Cobbler
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Cuisine: American, Southern
Ingredients: 3 ½ cups fresh blackberries; 1 ½ cups sugar (divided); 2 teaspoons lemon juice; ½ teaspoon zest (optional); 1 ½ cups all-purpose flour; 1 ½ teaspoons baking powder; ½ teaspoon salt; ½ cup unsalted butter (melted); 1 cup milk; 1 teaspoon vanilla extract