Preheat oven to 450°F.
In a medium bowl, whisk together the flour, baking powder, sugar, and salt.
Add buttermilk and mix just until a moist dough is formed.
Pour melted butter into an 8×8-inch baking dish and place dough on top of melted butter. Using a spatula, spread dough evenly across pan until it touches the sides.
Cut dough into 9 equal squares and bake until golden brown, 20-25 minutes. Enjoy!
