Heat oven to 375°F. Lightly grease 8x8-inch baking dish or spray with non-stick cooking spray.
In a medium bowl, combine drained peaches and sugar. Stir to combine. The mixture will create some liquid, this is normal.
Measure mix by lightly spooning it into measuring cup and leveling it off.
Combine mix, cinnamon and milk. Stir to combine. Do not over-mix. Add melted butter and stir to combine. Pour batter into prepared baking dish.
Top batter with peach mixture. Place in oven and bake 50-60 minutes or until golden brown and crust appears set. Remove from oven and allow to cool slightly
Can be served warm, topped with ice cream, or at room temperature.