Preheat the oven to 350 degrees F. Lightly grease a 9 x 13-inch baking dish.
Spread the apple pie filling evenly across the bottom of the prepared baking dish.
Sprinkle the dry spice cake mix evenly over the apple pie filling. Do not stir.
Arrange the butter slices evenly over the surface of the cake mix, covering as much of it as possible. This helps the topping bake evenly and prevents dry patches.
Bake for 40 to 45 minutes, or until the topping is golden brown and the apple filling is bubbling around the edges.
Let the cake cool for 10 minutes before serving. Enjoy warm on its own or with a scoop of vanilla ice cream, if desired.
Notes
Cover as much of the dry cake mix as possible with butter. Any uncovered spots may remain dry after baking.
The cake is done when the fruit filling is bubbling around the edges and the topping is golden brown.
For extra crunch, sprinkle chopped pecans or walnuts over the cake before baking.
Store leftovers tightly covered at room temperature for up to 3 days or in the refrigerator for up to 5 days.
Reheat individual servings in the microwave for 20 to 30 seconds before serving.