Preheat oven to 180 degrees Celsius
Add the self-raising flour, sugar and butter to a food processor. Pulse until it resembles fine breadcrumbs
Pour the buttermilk into the flour mixture and pulse until the dough clumps together. It takes about 4-5 pulses. Do not over process the dough
Remove the dough and flatten on a clean surface. I prefer using my hands but you can gently roll it using a rolling pin, if you prefer.
Cut them into circles with a cutter dipped in flour. Press the cutter straight down into the dough, do not twist the cutter. Or you will lose the layers
Brush the tops with buttermilk and bake at 180 degrees Celsius for 12-15 minutes or until edges are slightly brown
If you are using an egg you can brush the tops with egg wash instead of buttermilk
Brush scones with some melted butter (optional) once baked