Preheat the oven as high as it will go (usually 220℃ fan/240℃/Gas Mark 9). Line a baking sheet with baking paper.
Put the flour, baking powder, mustard powder and salt into a mixing bowl.
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!
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.
Lightly dust the worktop and a rolling pin with flour.
Roll out or pat the dough with your hands to slightly flatten to about 2.5cm-3cm thick.
Cut out 8 round circles using a 7cm round cutter or upturned glass.
Pop the scones onto the lined baking sheet, brush the tops with beaten egg and sprinkle over the remaining cheese.
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