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.
03 - Add cold cubed butter to dry ingredients. Using a pastry cutter or fingertips, work the butter into the flour mixture until it resembles coarse breadcrumbs.
04 - In a separate bowl, whisk together heavy cream, egg, and vanilla extract until combined.
05 - Pour wet mixture into dry ingredients and stir until just combined. Do not overmix.
06 - Gently fold chocolate chips into the dough using a spatula.
07 - Transfer dough to a floured surface and pat into a 7-inch circle approximately 1 inch thick.
08 - Cut the dough circle into 8 equal wedges and transfer to prepared baking sheet.
09 - Brush the tops of each scone with additional heavy cream for a golden finish.
10 - Bake for 16 to 18 minutes until scones are golden brown around the edges. Transfer to wire rack to cool.
11 - Whisk together powdered sugar, milk or cream, and vanilla extract until smooth.
12 - Drizzle glaze over completely cooled scones.