Preheat the oven to 400°F. Grease skillet with 1 tbsp of butter and set aside.
In a large bowl, combine ½ cup sugar, cornstarch, ¼ tsp salt, and 1 tbsp orange zest. Once combined, toss berries into mixture untill evenly coated. Stir in vanilla extract and lemon juice. Pour mixture into greased skillet.
In a medium bowl, combine 2 tbsp granulated sugar, 1 tbsp remaining orange zest, flour, baking powder, and 1 tsp remaining salt. Cut remaining 3 tbsp butter into flour mixture to form crumbs. (If you own a pastry cutter you may use it instead of the two fork method) Once small crumbs form stir in milk just until a soft dough forms. Spoon dough in a rustic style over berry mixture. Sprinkle with 1 tbsp remaining sugar.
Place the cast iron skillet into the oven and bake until golden and bubbling, about 30-35 minutes, mine was perfect at the 33 minute mark. Or cook on a grille set at medium for about 20 minutes.
Serve warm cobbler with whipped cream and/or vanilla ice cream. Enjoy!
