Preheat the oven to 350°F. Lightly grease a 9x13-inch baking dish.
Add the drained peaches to the prepared baking dish. Sprinkle with the cornstarch and ground cinnamon, then stir until the peaches are evenly coated.
Sprinkle the dry cake mix evenly over the peaches without stirring.
Evenly sprinkle the brown sugar over the cake mix.
Arrange the butter slices evenly over the top, covering as much of the surface as possible.
Bake for 40 to 45 minutes, or until the topping is golden brown and the peach filling is bubbling around the edges.
Let the cobbler cool for 10 minutes before serving.
Serve warm on its own or with vanilla ice cream or whipped cream, if desired.
Christina's Notes
Drain the peaches well so the topping bakes up golden instead of becoming soggy.
Slice the butter as evenly as possible and distribute it across the cake mix to help create a crisp, buttery topping.
Sprinkle chopped pecans or walnuts over the cake mix before baking for added crunch.
A light drizzle of vanilla icing after baking makes this dessert feel extra special.
Serve warm with vanilla ice cream, whipped cream, or fresh raspberries for an easy finishing touch.
Assemble the cobbler up to 8 hours ahead, cover, and refrigerate. Add the butter just before baking for the best topping texture.
Store leftover cobbler covered in the refrigerator for up to 4 days.
Freeze cooled cobbler in an airtight, freezer-safe container for up to 3 months. Thaw overnight in the refrigerator and reheat in a 325°F oven or microwave until warmed through.