Add 450 grams Self-raising Flour , to a large mixing bowl and whisk in 2 tsp Baking Powder (rounded), ½ tsp Salt, 2 - 3 tsp Mustard Powder, 1 tsp Powdered Garlic & ½ - ¾ tsp Smoked Paprika. **If using Plain or All Purpose flour, please remember to add 5½ level tsp baking powder, in addition to the 2 tsp above.**
Add 75 grams Butter to dry mixture, mix through briefly & 'Cut the butter' into the flour using a Pastry Cutter (Pastry Blender), until mixture resembles large breadcrumbs. Alternatively use 2 butter knives, or rub between your fingertips. (See in action, watch the air fryer video below). Then add in the 50 grams Caster Sugar and mix through.
Add 2 Med-Large Eggs to a jug, whisk together, & add in only enough of the 240 ml Milk or ButtermiIk, to come to 300ml (10 fl oz) mark. Whisk together and reserve 2 tbsp of the mixture in a small bowl for later.
Make a reservoir in the dry mixture, add ⅓ of the wet mixture & start to mix together with a spoon or spatula. Gradually add small amounts of the wet mixture until it starts to come together into a slightly sticky dough. **Please note you might not need all of the wet mixture or need a touch more (in which case just add milk).** Use the video as a reference point & get your hands in there to make sure there are no dry patches at the bottom of the bowl. Use your knuckles to spread out the dough a little, & add in half of the 100 grams Mature (or Extra Mature) Cheddar Cheese and briefly knead into the dough. Repeat with the rest of the cheese pieces, form into a ball then a disc shape. DO NOT USE A FOOD PROCESSOR OR MIXER.
Lightly dust baking/parchment paper or a clean worktop/counter & use your hands to gently pat the dough out to a depth of at least 1" (2⅓cm). Do not use a rolling pin.
Dip the cookie cutter in flour & cut out as many scones as you can get. ** DO NOT TWIST THE COOKIE CUTTER! ** This is very important for a good rise. Pull away excess dough, then transfer the scone to prepared paper lined baking tray/baking sheet. Any that stick in the cutter, carefully shake and let it fall onto the paper itself. **Try not to touch the sides of the scone if possible.**
Pull back the excess dough & gently bring together as best you can with minimal handling & no rolling out. Just pat out to at least 1" (2½ cm) deep. Cut out more scones & repeat till all the dough is used. (Yield 11-12 scones).
Next, very carefully brush reserved egg/milk mixture, on the tops of the scones only. DO NOT LET ANY DRIP DOWN THE SIDES - shake the brush, then start brushing from the centre of the top of the scone and work your way out to avoid drips.