Preheat your oven to 350°F (175°C). Lightly grease a 9x13-inch baking dish.
Spread the apple pie filling evenly across the bottom of the baking dish.
Stir the cinnamon, apple pie spice, and vanilla extract into the apple filling.
Sprinkle the dry yellow cake mix evenly over the apples. Don't stir—it should stay as a dry layer on top.
Slowly drizzle the melted butter over the cake mix, covering as much of the surface as possible.
If using, sprinkle the chopped pecans or walnuts over the top.
Bake for 45–50 minutes, or until the topping is golden brown and the apple filling is bubbling around the edges.
Let the dump cake cool for about 10 minutes before serving.
Serve warm with a scoop of vanilla ice cream, whipped cream, or a drizzle of caramel sauce.