Preheat the oven to 200°C (fan) / 220°C (conventional).
Mix the flour, bicarbonate of soda, and salt in a large bowl.
Add the grated cheese and the chives, and mix together.
Add most of the buttermilk and mix gently using a fork or your hands. Add more buttermilk as needed until you have a soft, slightly sticky dough. Do not knead it like yeast bread dough.
On a lightly floured surface, shape the dough into a round loaf. Place it on a baking tray lined with baking paper and cut a deep cross into the top.
Sprinkle a little extra cheese over the top if you like a strong cheesy flavour in your bread!
Bake for 30–35 minutes, until golden and cooked through. The base should sound hollow when tapped. Allow to cool on a wire rack before slicing.