01 - Heat oven to 400°F. Line a baking sheet with parchment paper.
02 - In a large bowl, whisk together flour, baking powder, salt, and black pepper.
03 - Add cold, cubed butter to dry ingredients. Use a pastry blender or your fingertips to cut butter into the flour until mixture resembles coarse crumbs.
04 - Fold in grated cheddar, Parmesan, chives, and parsley until evenly distributed.
05 - Whisk milk and egg together in a small bowl. Pour into flour mixture and gently stir until just combined, avoiding overmixing.
06 - Turn dough onto a lightly floured surface. Pat into a 1-inch thick disk.
07 - Cut disk into 8 wedges and arrange on prepared baking sheet, spacing evenly.
08 - Lightly brush tops of scones with milk for a golden crust.
09 - Bake for 16 to 18 minutes until scones are golden brown and cooked through.
10 - Allow to cool slightly before serving warm or at room temperature.