Prepare the oven and tray: Preheat the oven as high as it will go (usually 220℃ fan/240℃/Gas Mark 9). Line a baking sheet with baking paper.
Dry ingredients in: Put the flour, baking powder, mustard powder and salt into a mixing bowl. Add the chunks of butter.
Now 'rub in': Loosely lift some of the butter with the flour mixture and rub it between the tips of your thumb and fingers to break up the butter into smaller pieces until it looks like lumpy sand. This takes about 5 minutes. Be careful not to overwork it!
Bringing into a dough: Stir in half of the grated cheese, then add the milk and use your hands to gently bring it all together into a ball of dough.
Prepare the worktop: Lightly dust the worktop and a rolling pin with flour.
Roll the dough: Or pat the dough with your hands to slightly flatten to about 2.5cm-3cm thick.
Shape your scones: Cut out 8 round circles using a 7cm round cutter or upturned glass.
Get them ready for the oven: Pop the scones onto the lined baking sheet, brush the tops with beaten egg and sprinkle over the remaining cheese.
Time to bake: Bake for about 10 minutes, or until risen and golden.
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Calories: 435kcal | Carbohydrates: 51g | Protein: 14g | Fat: 19g | Saturated Fat: 11g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 5g | Trans Fat: 0.3g | Cholesterol: 72mg | Sodium: 544mg | Potassium: 308mg | Fiber: 2g | Sugar: 2g | Vitamin A: 593IU | Vitamin C: 0.02mg | Calcium: 305mg | Iron: 3mg