Preheat the oven to 220°C (425°F)on the middle rack until golden.
In a large bowl, whisk flour, baking powder, salt, and sugar until combined.
Cut cold butter into the flour until coarse crumbs form.
Gradually add buttermilk, stirring gently just until the dough comes together.
Turn dough onto a floured surface and pat into a 2.5 cm thick rectangle.
Fold dough 2–4 times to create clear flaky layers
Cut biscuits straight down without twisting.
Place biscuits close together or lightly touching for taller rise.
Bake for 12–15 minutes until golden and puffed.
Rest for 5 minutes before serving warm.