In a large bowl, whisk together the flour, baking powder, baking soda, sugar, and salt.
Add the butter to the flour mixture and use a pastry blender or your fingertips to cut the butter into the flour until the mixture resembles a coarse meal.
In a separate bowl, whisk together the buttermilk, egg, and heavy cream.
Add the wet ingredients to the dry ingredients and mix until just combined.
Turn the dough onto a lightly floured surface and knead gently 4 or 5 times.
Roll the dough into a circle about ½ inch thick.
Cut the dough into 8 wedges and transfer to a parchment lined baking sheet.
Brush the scones with the remaining heavy cream and sprinkle with the turbinado sugar.
Bake for 15-20 minutes, or until golden brown.
Interesting Facts
Scones are believed to have originated in Scotland as early as the 1500s.
Traditionally, scones are served with clotted cream and jam.
Scones can be made with a variety of different ingredients including dried fruits, chocolate chips, and even bacon.