Whisk together the flour, sugar, baking powder, baking soda, and salt.
Add the shredded cheese, then cut in the butter. When there are no chunks of butter larger than a pea, add the egg and buttermilk. Gently mix until mostly incorporated (it's okay to still be a bit crumbly).
Turn the dough out onto the counter and use your hands to bring it together and distribute the moisture — but don't overwork it! Shape into a 1" tall rectangle, and cut into 12 equal pieces.
Bake for 15-17 minutes, or until the tops are golden and the centers are fully cooked.
Recipe by The Kitchen Paper at http://c02.ddd.mwp.accessdomain.com/white-cheddar-buttermilk-biscuits/