Preheat oven to 400 degrees.
Peel and dice 7-10 medium apples.
Add the apples and butter to a cast iron skillet. Cook on medium heat for about 10 minutes, stirring frequently.
Meanwhile mix up the sourdough topping by combining all of the ingredients in a separate bowl.
When the apples in the cast iron skillet are cooked, but not yet soft, add the maple syrup, einkorn flour, cinnamon and nutmeg. (You can also use whole grain wheat flour, or all purpose flour.)
Cook an additional two minutes, until the apple juices and syrup have thickened.
Pour the sourdough topping over the apples.
Bake for 15 minutes at 400 degrees.
It tastes best warm, so serve immediately.
