Creating baked apples is simple and satisfying when you follow these easy steps:

1. Preheat Your Oven: Preheat your oven to 350°F (175°C).
2. Prepare the Apples: Core the apples, making sure to leave the bottom intact. This will hold the filling.
3. Make the Filling: In a bowl, combine brown sugar, cinnamon, nutmeg, rolled oats, chopped nuts, and raisins (if using). Mix until well combined.
4. Stuff the Apples: Spoon the filling mixture into each cored apple, pressing down gently to pack it in.
5. Add Butter: Place a tablespoon of butter on top of each stuffed apple.
6. Arrange in Baking Dish: Place the apples upright in a baking dish. Pour the apple cider or water into the bottom of the dish to keep the apples moist while they bake.
7. Bake: Cover the dish with aluminum foil and bake in the preheated oven for 30-40 minutes, or until the apples are tender.
8. Remove the Foil: After 20 minutes, remove the foil to allow the tops to brown slightly.
9. Check for Doneness: Test the apples with a fork; they should be soft but still hold their shape.
10. Let Cool: Allow the baked apples to cool for a few minutes before serving.

These steps will guide you in creating this incredible dessert effortlessly.