Preheat your oven to 220°C and line a baking sheet with parchment paper.
In a large bowl, whisk together your dry ingredients: flour, baking powder, sugar, salt, and baking soda.
Add the cold, cubed butter and toss it in the flour mixture to coat everything. Use a pastry cutter, or two forks to cut the butter into the flour mixture.
Now, add ¾ cup of the buttermilk and mix with a spatula until a shaggy dough forms. Don't worry if it seems a little dry, that's okay!
Flour your work surface and transfer the dough. Gently pat it out into a 10x8-inch rectangle, about ¼-inch thick.
Fold the dough in thirds like a letter, then rotate it 90 degrees and repeat the rolling and folding process two more times. This creates those beautiful layers!
On the final roll, shape the dough into a 10x5-inch rectangle, about ½ to ¾-inch thick.
Time to cut! Grab a floured 2 ½-inch round cutter and stamp out those biscuits. Place them on your baking sheet, almost touching each other. Brush the tops with the remaining buttermilk.
Pop those biscuits in the oven for 12-15 minutes, or until golden brown. Let them cool for a few minutes before devouring!