Preheat Oven: Preheat your oven to 350°F (175°C). 
Prepare Filling: Spread the apple pie filling evenly in a 9×13-inch baking dish. 
Add Cinnamon: Sprinkle the ground cinnamon over the apple pie filling. 
Add Cake Mix: Pour the cake mix evenly over the apples. 
Drizzle Butter: Drizzle the melted butter over the cake mix. 
Bake: Bake for 45-50 minutes, or until the top is golden brown and bubbly. 
Cool and Serve: Allow the cake to cool for a few minutes before serving. Optional: Serve with a scoop of vanilla ice cream.