Preheat your oven to 220°C (425°F) and line a baking sheet with parchment paper.
Whisk together the flour, baking powder, and salt in a large bowl until evenly combined.
Add the cold butter cubes to the dry ingredients and cut in with a pastry cutter or fork until the mixture looks like coarse crumbs with pea-sized bits of butter.
Pour in the chilled buttermilk and gently stir with a spatula or spoon just until the dough begins to come together.
Turn the dough onto a floured surface and fold it over onto itself 3-4 times, gently pressing to create layers that will result in flaky biscuits.
Pat the folded dough into a 1-inch thick rectangle, handling it gently to keep the layers intact.
Use a round cutter to cut out biscuits, pressing straight down and lifting straight up to help them rise properly.
Place the biscuits on the prepared baking sheet about 2 inches apart. Brush the tops with melted butter for extra shine.
Bake for 12-15 minutes, until the biscuits are golden brown and crackly on top, filling your kitchen with a buttery aroma.
Remove from the oven and transfer to a cooling rack; let cool for 5 minutes to firm up slightly before serving warm.
Enjoy these flaky, buttery biscuits plain or with your favorite spreads, savoring their crispy outside and tender, flaky inside.