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. Cut in using a pastry cutter or your fingertips until the mixture resembles coarse crumbs with pea-sized butter pieces remaining.
04 - In a separate bowl, whisk together the cold cream, egg, and vanilla extract until combined.
05 - Pour the wet ingredients into the flour mixture. Stir gently with a spatula until just combined. Do not overmix.
06 - Fold in the chocolate chips until evenly distributed throughout the dough.
07 - Turn the dough onto a lightly floured surface. Gently pat into a 1-inch thick circle, about 7 inches in diameter.
08 - Cut the circle into 8 equal wedges. Transfer wedges to the prepared baking sheet, spacing them 2 inches apart.
09 - Brush the tops of each scone with a thin layer of additional heavy cream for a golden finish.
10 - Bake for 16 to 18 minutes until golden brown on top 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.