Preheat the oven to 350°F (175°C).

In a mixing bowl, combine the drained canned peaches, sugar, cornstarch, and cinnamon. Stir until well mixed.

Pour the peach mixture into the bottom of a greased 9x9 inch baking dish.

In another bowl, mix together the flour, milk, melted butter, baking powder, sugar, and salt until just combined.

Pour the topping mixture over the peach filling, spreading it evenly.

Bake in the preheated oven for 30 minutes, or until the topping is golden brown.

Let cool for a few minutes before serving.