01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - In a large bowl, whisk together flour, sugar, baking powder, baking soda, and salt.
03 - Add cold cubed butter to dry ingredients. Use a pastry cutter or fingertips to cut in until mixture resembles coarse crumbs.
04 - In a separate bowl, whisk together cream, egg, and vanilla extract until combined.
05 - Pour wet ingredients into dry ingredients and stir gently until just combined. Fold in chocolate chips carefully to avoid overmixing.
06 - Turn dough onto a lightly floured surface. Pat into a 1-inch thick disk.
07 - Cut the disk into 8 equal wedges and space them evenly on the prepared baking sheet.
08 - Lightly brush the scone tops with additional cream for a golden finish.
09 - Bake for 16 to 18 minutes, or until the tops are golden brown. Cool on a wire rack.
10 - Whisk powdered sugar, milk, and vanilla extract until smooth. Drizzle over cooled scones.