Prepare the recipe ahead of time! In a small container, combine nutmeg, cinnamon, and brown sugar. Apples should be prepared and added to a big dish. Add 1/4 lemon juice, then cover the apples with water and seal the basin. In a medium bowl, combine the oats, flour, cinnamon, and salt; cover. Before using, drain the apples. When you're getting ready for supper, cook the apples and then pop everything into the oven to bake when you're ready!
It could take a little longer to cook the apples in the cast iron if you decide not to peel them. Just make sure the apples are cooked through.