01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt until well blended.
03 - Add the cold, cubed butter to the flour mixture. Using a pastry cutter or your fingertips, work the butter into the flour until the mixture resembles coarse crumbs with some pea-sized pieces remaining.
04 - In a separate bowl, whisk together the heavy cream, egg, and vanilla extract until fully combined.
05 - Pour the wet ingredients into the flour mixture. Stir gently with a spatula or wooden spoon until just combined. The dough should be slightly shaggy but hold together.
06 - Fold in the chocolate chips gently until evenly distributed. Take care not to overmix, which can make scones tough.
07 - Turn the dough out onto a lightly floured surface. Gently pat into a disc about 1 inch thick. Handle the dough as little as possible for tender results.
08 - Cut the disc into 8 equal wedges using a sharp knife or bench scraper. Transfer wedges to the prepared baking sheet, spacing them 2 inches apart.
09 - Brush the tops of each scone with a small amount of extra heavy cream to promote golden browning.
10 - Bake for 16 to 18 minutes until the tops are golden brown and a toothpick inserted in the center comes out clean.
11 - Let scones cool on the baking sheet for 5 minutes, then transfer to a wire rack. Serve warm or at room temperature.