Peel and slice the apples, and add to a mixing bowl. Add the fresh lemon juice, vanilla, brown sugar, cinnamon, and cornstarch. Mix well, and pour into a greased cast iron skillet (or other oven friendly dish/pan).
Place skillet in oven and bake for 20 minutes.
Meanwhile, prepare the topping. In a mixing bowl, combine the flour, sugar, brown sugar, baking soda, and salt. Using a pastry cutter (or your hands), cut the COLD butter into the ingredients, until the topping resembles course crumbs.
Place 1/3 cup water in microwave, and heat until boiling. Pour over the topping ingredients, stir well, and add to top of skillet with apples. Top with a dusting of sugar.
Bake for 20-25 minutes, or until golden brown.
Serve warm, fresh from the oven, with scoops of vanilla ice cream!
Instead of using one kind of apple, feel free to mix a few different kinds!
You can use a food processor or your hands (instead of a pastry cutter) to cut the butter into the topping mixture.
Any oven friendly baking dish will work just fine for this cobbler.
You could also double this recipe and use a 9x13 baking dish.