01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper to prevent sticking and ensure easy cleanup.
02 - In a large bowl, whisk together the all-purpose flour, granulated sugar, baking powder, baking soda, and salt until evenly distributed.
03 - Add the cold, cubed butter to the flour mixture. Use a pastry cutter or fingertips to work the butter into the dry ingredients until the texture resembles coarse crumbs.
04 - In a separate bowl, whisk the cold buttermilk, large egg, and pure vanilla extract until fully combined.
05 - Pour the wet mixture into the dry ingredients. Add the semi-sweet chocolate chips. Stir gently with a spatula or wooden spoon until just combined; be careful not to overmix to ensure tenderness.
06 - Turn the dough out onto a lightly floured surface. Gently pat the dough into a circle about 1 inch thick and approximately 8 inches in diameter.
07 - Use a knife or bench scraper to cut the dough circle into 8 equal wedges. Place the wedges onto the prepared baking sheet, leaving space between them for expansion.
08 - Bake for 16 to 18 minutes, or until the tops are golden brown. Remove from the oven and allow the scones to cool slightly on the pan.
09 - While scones cool, whisk together the powdered sugar, 2 tablespoons of milk, and vanilla extract in a small bowl. Gradually add more milk until the glaze reaches a thick but pourable consistency.
10 - Drizzle the vanilla glaze generously over the warm scones. Allow the glaze to set for a few minutes before serving.