1. Preheat oven to 425.
2. Place the flour, baking powder, baking soda, sugar and salt in a medium bowl and whisk thoroughly distributed. Mix in cheese.
3. Add buttermilk and gently mix until loose, and turn on to a floured surfance. (the dough will be sticky).
4. Lightly flour your hands and then gently knead and shape the dough into a ball. Flatten the ball into a 1 thick disc.
5. Cut the dough into rounds with a 2 cookie cutter and set them on a parchment paper lined baking sheed.
6. Brush the tops of the biscuits with beaten egg. Bake in the middle of the oven for 12 - 14 minutes, or until puffed and golden.