Creating Cinnamon Apple Dump Cake can be straightforward if you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).
2. Prepare the Dish: Grease a 9×13-inch baking dish with cooking spray or butter.
3. Layer Apple Filling: Spread the apple pie filling evenly across the bottom of the baking dish.
4. Sprinkle Cinnamon: Evenly sprinkle the ground cinnamon over the apple pie filling.
5. Add Cake Mix: Pour the dry yellow cake mix over the apple filling. Do not mix.
6. Add Nuts and Oats: If using, sprinkle the chopped nuts and rolled oats on top of the cake mix.
7. Drizzle Butter: Pour the melted butter evenly over the entire mixture, ensuring everything is covered.
8. Optional Topping: For added sweetness, sprinkle brown sugar over the melted butter.
9. Bake: Place in the preheated oven and bake for 45-50 minutes or until the top is golden brown and bubbly.
10. Cool: Remove from the oven and let it cool for about 10-15 minutes before serving.

By following these steps, you will create a wonderfully delicious Cinnamon Apple Dump Cake that is sure to be a hit!