01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - In a large mixing bowl, whisk together flour, sugar, baking powder, and salt until evenly distributed.
03 - Add cold cubed butter to the flour mixture. Using a pastry cutter or fingertips, work the butter into the flour until the mixture resembles coarse breadcrumbs with pea-sized pieces of butter visible.
04 - In a separate bowl, whisk together heavy cream, egg, and vanilla extract until well combined.
05 - Pour the wet mixture into the dry ingredients and stir gently with a spatula until just combined. Avoid overmixing to maintain a tender crumb structure.
06 - Gently fold the semi-sweet chocolate chips into the dough using a spatula, distributing evenly throughout.
07 - Turn the dough onto a lightly floured surface and gently pat it into a 7-inch circle approximately 1 inch thick, being careful not to compress the dough excessively.
08 - Using a sharp knife or bench scraper, cut the circle into 8 equal wedges. Transfer wedges to the prepared baking sheet, spacing them about 1 inch apart.
09 - Brush the tops of each scone lightly with additional heavy cream to achieve a golden finish when baked.
10 - Bake for 16 to 18 minutes until the scones are golden brown around the edges. Transfer to a wire rack to cool completely.
11 - Whisk together powdered sugar, milk or cream, and vanilla extract until achieving a smooth, pourable consistency. Drizzle the glaze evenly over the cooled scones.