Pre-heat your oven to 300˚.
In medium bowl whip the butter for the base for several minutes until it becomes white. Add in sugar, vanilla, and salt and continue to mix until combined. Add in flour and mix.
Press mixture into a prepped 8x 8x baking dish and bake for about 15 minutes.
In another bowl combine apples, flour sugar, cinnamon and nutmeg. Toss until apples are completely coated.
In a small bowl mix all of the topping ingredients together.
Remove crust from the oven and turn heat up to 350˚. Layer your apples on the shirt bread and topping over that. Place in the oven and bake for about 30 minutes. Then chill for a couple of hours so it can set and be sliced to serve.