Preheat oven to 425°F (220°C) and line a baking sheet with parchment paper.
In a large bowl, whisk together flour, baking powder, baking soda, salt, and sugar.
Cut in the cold butter using a pastry cutter or your fingertips until the mixture resembles coarse crumbs.
Make a well in the center and pour in the cold buttermilk; stir just until the dough comes together.
Turn the dough onto a lightly floured surface and fold it over itself 3–4 times to create flaky layers.
Roll out the dough to a 1-inch thickness and cut with a 2.5-inch biscuit cutter.
Place biscuits close together on the prepared sheet for soft edges.
Bake for 12–15 minutes until golden brown.