First, make the biscuits. Pre-heat the oven to 350 and line a sheet tray with a silicone mat. Then set up a food processor and combine the flour, baking powder, chives, cheddar and salt together in its bowl. Pulse it together a few times to thoroughly combine it all. Add the butter next and pulse it all a few more times until it looks pebbly. Finally, add the buttermilk and pulse it until it comes together into a sticky dough. Turn the dough out onto a well floured, clean surface and bring it together into a ball. Press the ball out into a 1 inch high disc with floured hands. Then use a floured 3 inch biscuit cutter to cut out 4 biscuits. Bring the scraps together and press them out again to cut out two more. Line them up on the sheet tray and bake them for 15-20 minutes.