Preheat your oven to 425°F (220°C) and line a baking sheet with parchment paper.
In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, baking powder, and salt until well combined.
Add the cold, cubed butter to the dry ingredients. Using a pastry cutter or fork, cut the butter into the flour mixture until it resembles coarse crumbs.
Make a well in the center of the mixture. Pour in the cold buttermilk and vanilla extract. Stir gently with a spatula or wooden spoon until just combined.
Turn the dough out onto a lightly floured surface. Gently knead the dough a couple of times until it comes together. Pat it into a circle about 1 inch thick.
Using a cookie cutter or a glass, cut out rounds from the dough. Place them on the prepared baking sheet, leaving space between each scone.
Bake in the preheated oven for 12-15 minutes or until the scones are golden brown on top.
Remove the scones from the oven and allow them to cool slightly on a wire rack. Serve warm with clotted cream and jam.