Using the fine edge of your grater, grate butter onto parchment paper. Then place it in the freezer while you prepare the remaining ingredients.
In a large bowl, whisk together flour, sugar, salt, and baking powder.
Remove the grated butter from the freezer and, using a fork, incorporate it into the dry ingredients.
In a small mixing bowl, whisk together eggs, vanilla, and heavy whipping cream. Pour this mixture into the dry ingredients and stir until combined.
Line a baking sheet with parchment paper.
Scoop the dough out onto the lined baking sheet. Use your hands to form a circle that is about ¾-inch thick. (Add a bit of flour to your hands to prevent sticking.)
Chill the dough in the freezer for no less than 30 minutes, preferably an hour.
Preheat the oven to 425°F.
Using a bench scraper or a large knife, slice the circle into 6-8 wedges. Using your hands, gently separate the edges of each scone, creating a space of about ½ inch between each.
Use a pastry brush to brush each scone with heavy whipping cream on all exposed sides.
Sprinkle each scone with 1 teaspoon of turbinado sugar.
Bake for 18-23 minutes or until golden brown.