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Preheat the oven to 220C.
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Line a baking sheet with parchment paper.
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In a large bowl, combine the flour, sugar, baking powder, baking soda and salt.
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Add the cold diced butter and mix with your fingers until you get a sandy mixture.
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In a medium bowl, whisk together buttermilk, egg and vanilla.
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Stir this liquid mixture into the flour mixture until it is crumbly but not completely blended. Gently stir in the raspberries until the dough comes together.
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Pour the dough onto a lightly floured surface and form a circle about 1.5 cm thick.
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Cut into 8 wedges and place on the prepared baking sheet. Brush with melted butter and sprinkle with sugar.
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Bake until scones are golden, about 15 to 20 minutes.