This cobbler is really simple. It can be made with any kind of fruit, even canned fruit. I prefer it made with fresh fruit. It really is best made in a cast iron skillet, but if you don't have one any 8 inch baking dish will do. Cast iron just retains heat so well that you will always get crisp edges.
Meanwhile in a bowl whisk together the flour, sugar, salt, baking soda, cinnamon, vanilla, and milk.