In a large mixing bowl, whisk together flour, baking powder, and salt.
Add butter and cut in with a pastry blender until pea-size clumps form.
Create a well in the center. Pour buttermilk into the well. Mix gently with a fork until JUST combined.
Turn the dough out onto a floured surface and create a rectangle using your hands.
Fold the dough into thirds (like folding a letter). (Fold left side over center, then right side, so it's still in a rectangular shape.) Then roll back out to 1-inch thick. Repeat the folding and rolling process twice more, Rolling the dough out to ½" thick on the final time.
Cut out about 12 biscuits with a 2"-3" round cutter. Re-roll any scraps and cut again. Transfer biscuits to a baking sheet.
Bake for 17-20 minutes until cooked through and golden brown on top.