Preheat oven to 350ºF (180ºC).
Grease or line with parchment paper two baking sheets.
In the bowl of a food processor, put 2 ¼ cups all-purpose flour, ⅓ cup sugar, 1 tablespoon baking powder and ⅛ teaspoon salt. Process for a few seconds, just to mix.
Scatter 6 ounces unsalted butter over this mixture and pulse a few times until the butter is the size of peas. If making by hand use a large bowl and cut the butter with your hands or a pastry cutter. Then follow the recipe below.
Transfer the mixture to a large bowl. Pour ¼ cup whole milk and ½ cup heavy or heavy whipping cream and stir quickly with a fork, mixing everything until most of it is moistened.
Dump it onto the kitchen counter and quickly give it a few turns to avoid very dry spots. Some dry parts will remain and that is OK. The more you touch it and mix it, the tougher the baked scones will be.
Pat the mixture about 1 to 1.5-inches high.
With a round, small cookie cutter cut scones (you might need to dip the cutter periodically in flour to aid with this) quickly and arrange them on the baking sheets.
Brush the tops lightly with additional cream and sprinkle with sugar.
Bake for about 20 minutes, until they're puffed, the tops are golden and the insides are fully baked. If in doubt, lift one with a fork and check that the crumb is dry and not still wet.
Eat warm. Store leftovers in a tin or airtight container and warm briefly in the oven before eating.