1-Preheat the oven to 220C/200Fan/400F: Preheat the oven to 220C/200Fan/400F.
2-Grease and line two large baking trays: Grease and line two large baking trays.
3-Place the flour, baking powder, mustard powder: Place the flour, baking powder, mustard powder and salt in a large bowl. Rub the butter into the dry ingredients until it resembles breadcrumbs.
4-Add the grated cheese and fresh chives: Add the grated cheese and fresh chives and lightly stir with your hands to combine.
5-Pour in most of the milk (you: Pour in most of the milk (you might not need it all so keep about 25ml back) and using your hands, lightly mix until you have a soft, moist dough and no dry crumbs remain on the bottom of the bowl. If the dough seems a little dry, add the remaining milk.
6-Turn the dough out onto a lightly: Turn the dough out onto a lightly floured surface. Lightly pat out to a rough square, no less than 1 Inch thick. Using a large cutter, cut out rounds. Don’t twist the cutter when cutting the scones or your scones will rise unevenly.
7-Repeat cutting out the scones until all: Repeat cutting out the scones until all the dough is used up. You don’t need to knead the dough when re-rolling – just simply push it back together lightly with your hands. Bear in mind that the less you handle the dough, the lighter your scones will be.
8-Place the scones on the baking trays,: Place the scones on the baking trays, brush with the beaten egg yolk or milk (try not to let the liquid run down the sides or it could affect the rise) and sprinkle over the 25g grated cheese. Immediately place in the oven and bake for 12-15 minutes or until well risen and golden on top. The smell of the scones baking will make you ravenous!
9-Delicious served warm with lots of butter,: Delicious served warm with lots of butter, ham, or chutney.