Preheat your oven to 350°F (175°C).
Grease a 9x13-inch baking dish.
Spread the cherry pie filling evenly across the bottom of the prepared baking dish.
Evenly sprinkle the dry cake mix over the cherry filling. Do not stir; let it sit on top.
Pour the melted butter evenly over the top of the cake mix. Make sure to cover as much of the cake mix as possible for even baking. Sprinkle on the brown sugar if using.
Bake in the preheated oven for 45-55 minutes, or until the cake is golden brown and bubbly. The edges may be slightly crisp, which is perfect!
Let the dump cake cool for a few minutes. Serve warm, topped with whipped cream or a scoop of vanilla ice cream if desired.