Preheat the oven to 425 degrees. Spray an eight-by-eight-inch baking dish with cooking spray and set aside.
In a mixing bowl, combine the topping ingredients until everything is well incorporated. Set it aside.
In another bowl, combine all of the filling ingredients, stirring to coat the peaches. Pour the filling into the prepared pan and then sprinkle the topping evenly over the peach mixture.
Bake for 25 minutes.
Serve warm for best results, along with your favorite vanilla ice cream, and refrigerate any leftovers.