Slice apples.
Mix apple slices, cinnamon, and nutmeg in a bowl.
Mix oats, flour, sugar, baking powder, salt, and butter to make crust.
Press half the crust mix into the bottom and sides of the dutch oven.
Pour the apples onto the crust.
Cover apples with the rest of the crust mix.
Bake covered about 45 minutes, until top crust is light brown and apples are tender.