Preheat the oven to 220°C (425°F).
In a large bowl, combine all-purpose flour, baking powder, and salt.
Add cold butter and mix it into the flour until the mixture resembles coarse crumbs.
Pour in the cold buttermilk and gently mix until a soft dough forms.
Place the dough on a lightly floured surface, gently fold it a few times, and cut it into biscuit shapes.
Arrange the biscuits on a baking tray and bake for 12–15 minutes until golden brown.
Brush with melted butter if desired and serve warm.