Scones, like biscuits, are most tender when handled minimally. So use a soft touch when mixing and patting the dough. The scones can be made the night before, left unbaked and refrigerated. They can go straight from fridge to oven; just add 5 minutes to the baking time.
- Preheat oven to 350°F. Grease baking sheet. In large bowl, mix flour, sugar, baking powder and salt. Cut in butter with pastry blender or two knives until mixture resembles coarse meal.
- Mix buttermilk, zest, vanilla and egg in medium bowl. Stir in dried blueberries. Add to flour mixture, stirring just until moist (dough will be sticky).
- Turn dough out onto lightly floured surface. Pat into 8-inch circle about 3/4-inch thick. Use 2-inch round cookie cutter to cut out dough. Form scraps into more scones. Place 1/2 inch apart on baking sheet. (If making ahead, stop here, wrap tightly in plastic and refrigerate.) Brush tops with milk, and sprinkle with sugar.
- Bake 12 to 14 minutes, until tops are lightly browned.