Source: HowToCook (a programmer's guide)
Scones live and die by the butter. Keep it cold — colder than your hands — because the pockets of solid fat steam in the oven's heat, creating lift and a tender crumb. Warm butter disperses into the flour and gives you a dense, cake-like brick instead. Cube the butter straight from the fridge, then rub it into the flour, salt, sugar, and baking-powder with your fingertips using a light, quick motion. The mixture should resemble coarse breadcrumbs with visible flecks of butter still visible — this isn't creaming, and you're not aiming for uniformity. Stop the moment you reach that state; overworking develops gluten, which tightens the crumb.
Warm the cream cheese to 40°C in a bowl set over hot water — it needs to blend smoothly without deflating the egg. Beat the egg, measure 30g of the beaten mixture into a separate bowl, then whisk in the cream cheese and double cream until you have a smooth, pourable liquid. The remaining 20g of egg is for glazing. Make a well in your dry mixture and pour the liquid into it all at once. Fold and press gently with a spatula until the dough just comes together; streaks of flour are acceptable, even preferable. Overworking here kills the rise.
Turn the dough onto a lightly floured surface and roll to 1.5 cm thickness — measure this with your fingers or a ruler if you're unsure, as thickness directly controls bake time and interior texture. Cut into rounds or squares with a sharp, downward motion; twisting a cutter seals the edges and prevents a good rise. Place on a lined baking tray and brush each scone with the reserved egg wash. Chill for 15 minutes while you preheat the oven to 200°C, not 180°C — the higher heat ensures aggressive oven-baking and a pale golden surface with a pronounced baking set before the interior dries out.
Bake for 12 to 15 minutes. The scones are done when the tops are light golden and the sides feel firm to a light prod; they should still yield slightly at the base. Remove and cool on a wire rack. Serve warm, split horizontally, with jam and clotted cream.
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