Preheat your oven to 350°F and prepare a 9×13-inch baking dish by coating it with cooking spray.
Begin by spreading the cherry pie filling evenly across the bottom of your prepared baking dish. Next, sprinkle the yellow cake mix evenly over the cherries, making sure it covers the entire surface. Finally, drizzle the melted butter over the top of the cake mix. It's okay if the butter doesn't cover the entire surface; it will spread as it bakes.
Place the dish in the oven and bake for up to 1 hour, or until the top is beautifully golden brown.
Serve the cake warm, preferably with a generous scoop of ice cream on top for an extra treat.