Preheat your oven to 450°F (230°C).
In a medium bowl, whisk together flour, baking powder, salt, and sugar.
Gradually add buttermilk, stirring until a soft dough forms.
Pour melted butter into an 8x8-inch baking dish.
Spread the dough evenly in the dish, ensuring the top is smooth.
Score the dough into 9 pieces using a knife.
Bake for 20-25 minutes or until golden brown.
Let cool slightly before serving.