Preheat the Oven
Preheat your oven to 350°F (175°C).
Layer the Peaches
Spread the drained peaches evenly in the bottom of a 9x13-inch baking dish. Sprinkle cinnamon over the peaches if desired for added warmth and flavor.
Add the Cake Mix
Evenly sprinkle the dry cake mix over the peaches, spreading it to cover the fruit completely.
Drizzle with Butter
Drizzle the melted butter evenly over the top of the cake mix. Be sure to cover as much of the mix as possible to achieve a golden, crispy crust when baked.
Bake
Bake in the preheated oven for 45-50 minutes, or until the top is golden brown and bubbly. Let it cool for a few minutes before serving.