Make sure the ingredients are cold. I put the butter pieces in the freezer for 5-10 minutes, and keep the buttermilk and cream in the fridge up to the last minute.
Have ready a cookie sheet lined with parchment paper.
Preheat oven to 375ºF (190ºC).
In a large bowl put flour, baking powder (don’t forget or your scones won’t rise!), salt and sugar. Mix lightly with your hand or fork.
Scatter cold butter on top and start working it into the flour mixture. You can use a dough cutter. Mix it with the dry ingredients but be careful not to warm it too much. If you feel it starts to soften too much, pop the bowl in the fridge for a few minutes, or the freezer.
The butter should have some pieces the size of peas.
Lightly beat the egg in a small bowl, just to mix it, so it integrates better.
Make a well in the middle, and add the egg, half the buttermilk, and the cream.
With a fork or spoon, lightly stir and begin to incorporate the flour. The flour and butter should be wet but dry spots must be seen.
If needed, add the rest of the buttermilk a little at a time. You might end up using all of it or not.
Transfer to a clean surface or counter that is lightly dusted with flour.
Gather it and turn it onto itself a few times. The dough will be floury and messy, but you don’t want to work it too much or make it as smooth as pie dough.
After a few turns, it will come together if you take a bit and squeeze it; it should come together and not be too wet or too dry.
Press the whole mixture about 1-inch thick. The outer parts will be dry, don’t worry.
With a round cookie cutter (I use a flower shape sometimes because I like how irregular they bake) cut the scones and put on the prepared pan, leaving 2 inches or so between them.
Repeat with the remaining dough, bringing in the outer dry parts and incorporating it into the dough.
When all you’re scones are cut, I like to take the sheet to the freezer for 5 minutes.
Then bake for 20 minutes or so, until puffed, dry, and a bit golden. If you open one it should be dry inside.
I recommend eating them freshly baked.
Keep leftovers in tins and re-warm in a medium oven before eating.
See the Notes below for freezing instructions.