Blueberry-Buttermilk Scones

from Martha Stewart Living | makes 12 scones

1 1/2 cup all purpose flour
1/2 cup cake flour (not self-rising)
3 Tbs granulated sugar
2 1/2 tsp baking powder
3/4 tsp salt
4 oz (1 stick) cold unsalted butter
1 cup blueberries
1/2 cup low-fat buttermilk
1 large egg plus 1 large egg lightly beaten for egg wash
1/2 tsp pure vanilla extract
fine sanding sugar, for sprinkling

1. Preheat oven to 375*. Line a baking sheet with parchment paper,

2. Whisk together flours, granulated sugar, baking powder, and salt in a large bowl. Cut in butter with a pastry cutter, or rub in with your fingers, until mixture has texture of coarse meal. Stir in blueberries.

3. Whisk together buttermilk, 1 egg and the vanilla. Drizzle over flour mixture and stir lightly with a fork until dough comes together but a small amount of flour remains in bowl.
4. Turn out dough onto a work surface, and gently knead dough once or twice just to incorporate flour. Pat dough into 1-inch-thick round. Cut into 12 wedges, transfer to prepared baking sheet. Brush with egg wash, and sprinkle with sanding sugar. Bake until golden brown and cooked through, about 22 minutes. Transfer scones to wire racks to cool.

Scones are best served immediately but can be frozen for up to 1 month. Thaw and reheat in a 350* oven for 10 minutes.