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 until well combined.
03 - Add cold, cubed butter to the dry mixture. Use a pastry cutter or fingertips to work butter into flour until mixture resembles coarse crumbs.
04 - In a separate bowl, whisk together buttermilk, egg, and vanilla extract. Pour into dry mixture and stir gently until just combined.
05 - Fold chocolate chips into the dough gently. Take care not to overmix.
06 - Turn dough onto a lightly floured surface. Pat into a 1-inch thick circle and cut into 8 equal wedges.
07 - Place scones on prepared baking sheet with space between each piece. Bake for 16-18 minutes until golden brown.
08 - Remove from oven and transfer scones to a wire rack. Allow to cool completely before glazing.
09 - Whisk together powdered sugar, milk, and vanilla extract until smooth and pourable. Adjust consistency with additional milk if needed.
10 - Drizzle vanilla glaze over cooled scones. Serve warm or at room temperature.