Preheat the oven to 425°F and line a baking sheet with parchment paper.
In a large bowl, whisk together flour, baking powder, salt, and sugar.
Grate the cold butter directly into the dry ingredients. Toss lightly to coat.
Pour in the milk gradually, stirring gently until the dough just comes together.
Turn the dough onto a floured surface, pat it into a rectangle, and fold it over itself 2-3 times for flaky layers.
Use a biscuit cutter or a glass to cut out rounds. Arrange them on the prepared baking sheet.
Bake for 12-15 minutes, or until golden brown. Brush the tops with melted butter for extra flavor.