Preheat oven to 350°F or 175°C

Pour melted butter into an 8×8 inch baking dish and coat the bottom evenly

Mix flour, sugar, baking powder, and milk until just combined without overmixing

Pour batter over butter without stirring and let it settle

Add drained peach slices evenly on top without mixing

Bake for about 30 minutes until golden brown with slightly crisp edges

Let cool slightly before serving so it sets while staying warm