Preheat your oven to 350°F (175°C). Grease a 9x13 inch baking dish with nonstick spray or butter.
In a large mixing bowl, combine the drained peaches, sugar, and ground cinnamon. Mix gently until the peaches are well-coated in the sugar and cinnamon.
Pour the peach mixture into the prepared baking dish, spreading it evenly across the bottom.
Evenly sprinkle the dry yellow cake mix over the layer of peaches. Do not mix; just spread the cake mix as uniformly as possible.
Drizzle the melted butter over the top of the cake mix, ensuring that all areas are covered. The butter will soak in while baking to create a crispy topping.
If desired, sprinkle the chopped pecans on top for added crunch and flavor.
Bake in the preheated oven for 45-50 minutes, or until the top is golden brown and bubbly.
Remove from the oven and let it cool for a few minutes before serving.
Serve warm, preferably with a scoop of vanilla ice cream on top.
Notes
Serve warm with vanilla ice cream for the best experience.