Cast iron skillets aren't just for frying chicken. This time-honored, heavy-duty pan is the perfect vessel for making fruit-filled desserts that look great when served directly in the skillet. Baking this easy-to-make blackberry cobbler in your large cast iron skillet is an excellent way to use fresh blackberries in a dessert, but feel free to make the cobbler with raspberries or strawberries instead, or to combine raspberries with your blackberries when in season.