In a food processor, combine flour, sugar, salt, baking powder, and butter. Mix until just barely combined. With these ingredients, the mixture should still resemble a fine powder.
In the same food process, add heavy cream (or buttermilk), egg, and vanilla extract. Mix until combined but don’t overmix.
Tip the dough out onto a work surface dusted with flour. Mix in your add-ins by folding them in with your hands or a spatula. Once they are properly distributed, the dough is finished! Now would be a good time to put the dough in the freezer.
Shape your scones and place them on a baking sheet lined with parchment paper. You can cut your scones using a circular cutter or cut them into triangles using a knife. Place in the fridge for at least 15 minutes or freezer for at least 10 minutes. Preheat your oven to 400º F
Remove scones from the fridge or freezer. Brush the tops with heavy cream (or buttermilk or egg wash). Bake for 18 – 26 minutes (depending on size) or until golden brown.
When finished baking, remove from oven and let cool. Add any toppings you may have chosen and serve!