01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - In a large bowl, whisk together flour, sugar, baking powder, and salt.
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 crumbs.
04 - In a separate bowl, whisk together heavy cream, egg, and vanilla extract until combined.
05 - Add the wet mixture to the dry ingredients and stir until just combined. Avoid overmixing.
06 - Gently fold the chocolate chips into the dough.
07 - Turn dough onto a floured surface and pat into a 7-inch circle approximately 1 inch thick.
08 - Cut the circle into 8 wedges and transfer to the prepared baking sheet.
09 - Brush the top of each scone with additional heavy cream for a golden finish.
10 - Bake for 16 to 18 minutes until the scones are golden brown around the edges. Cool on a wire rack.
11 - Whisk together powdered sugar, milk or cream, and vanilla extract until smooth. Drizzle the glaze over cooled scones.