Preheat oven to 400°F (200°C).

In a large bowl, combine flour, baking powder, and salt.

Cut in cold butter using a pastry blender or your fingers until the mixture resembles coarse crumbs.

Add milk and mix until just combined. The dough will appear shaggy at first.

Continue mixing until the dough comes together and is smooth.

Turn the dough out onto a lightly floured surface.

Roll the dough to 1/2 inch thickness.

Use a round cutter (or a knife) to cut out scones.

Place scones on a baking sheet lined with parchment paper.

Brush the tops of the scones with beaten egg.

Bake for 15 minutes, or until golden brown.

Serve warm with butter and jam.