Preheat the oven to 350°F (175°C). In a baking dish, spread the sliced peaches evenly.

In a mixing bowl, combine the self-rising flour, granulated sugar, and milk. Stir until smooth.

Pour the melted butter into the baking dish over the peaches, then pour the batter over the butter.

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

Let it cool slightly before serving.