1. Preheat the oven to 350°F.
2. Core each apple and then hollow it out slightly, so the apples look like little pots.
3. Once hollowed, place the apples in a rimmed baking dish and set aside.
4. In a large bowl, mix together the oats, sugar, cinnamon, and nutmeg.
5. Once mixed, slowly add in the butter, a slice at a time, to fully combine into a thick, clumpy filling.
6. Scoop the combined filling into the hollowed apples, trying to ensure each apple gets the same amount of filling.
7. Once the apples are stuffed, bake them in the hot oven for 30 to 45 minutes, until the apples are soft and the filling is bubbling.
8. Once baked, remove the apples from the oven, let them cool, and then dig in!
