Blueberry White Chocolate Scones

Adapted from  Blueberry Scones @ Cook's Illustrated

It is important to work the dough as little as possible—work quickly and knead and fold the dough only the number of times called for. The butter should be frozen solid before grating. In hot or humid environments, chill the flour mixture and work bowls before use. While the recipe calls for 2 whole sticks of butter, only 10 tablespoons are actually used (see step 1). If fresh berries are unavailable, an equal amount of frozen berries (do not defrost) can be substituted. An equal amount of raspberries, blackberries, or strawberries can be used in place of the blueberries. Cut larger berries into 1/4- to 1/2-inch pieces before incorporating.

• 2 sticks unsalted butter, (16 Tablespoons) frozen whole (see note above)
• 1 1/2 cups  fresh blueberries or any other fresh or frozen berry that you may have on hand  (see note above)
• 1/2 cup white chocolate chips (optional)
• 1/2 cup whole milk
• 1/2 cup sour cream
• 2 cups unbleached all-purpose flour, plus additional for work surface
• 1/2 cup granulated sugar
• 2 teaspoons baking powder
• 1/4 teaspoon baking soda
• 1/2 teaspoon salt
• 1 teaspoon grated lemon zest
• Course sugar for sprinkling on top

1. Adjust an oven rack to middle position and heat oven to 425 degrees. Line a baking sheet with parchment paper.

2. Score and remove half of the wrapper from each stick of frozen butter. Grate the unwrapped ends on large holes of box grater (you should grate total of 8 tablespoons). Place grated butter in freezer until needed. Melt 2 tablespoons of remaining ungrated butter and set aside. Save remaining 6 tablespoons butter for another use. Place blueberries and white chocolate chips in freezer until needed.Whisk together milk and sour cream in medium bowl; refrigerate until needed.

3. Whisk the flour, 1/2 cup sugar, baking powder, baking soda, salt, and lemon zest in medium bowl. Add frozen grated butter to flour mixture and toss with fingers until thoroughly coated. Fold in the chilled milk mixture with a spatula until just combined (do not over mix).

 4. Turn the dough and any floury bits onto a well floured work surface. Lightly flour your hands and the dough and knead the dough gently 6-8 times until it just holds together in a ragged ball, adding additional flour as needed to prevent sticking.

5. Roll dough
into approximate 12-inch square. Then fold dough into thirds like a business letter, using bench scraper or metal spatula to release dough if it sticks to counter top. Lift short ends of dough and fold into thirds again to form approximate 4-inch square. Transfer dough to plate lightly dusted with flour and chill in freezer 5 minutes.

6. Transfer dough to floured work surface and roll again into a 12-inch square. Sprinkle blueberries and white chocolate chips evenly over surface of dough, then press down so they are slightly embedded in dough. Using bench scraper or thin metal spatula, loosen dough from work surface. Roll up dough, pressing to form tight log, and pinch the seam closed. Lay seam-side down and press log into 12 by 4-inch rectangle. Using sharp, floured knife, cut rectangle crosswise into 4 equal rectangles. Cut each rectangle diagonally to form 2 triangles.

7. Transfer the scones to parchment-lined baking sheet. Brush tops with melted butter and sprinkle lightly with course sugar. Bake until tops and bottoms are golden brown, 18 to 25 minutes, rotating the pan halfway through baking. Transfer to wire rack and let cool 10 minutes before serving.*Refrigerate or freeze leftover scones, wrapped in foil, in an airtight container. To serve, remove foil and place scones on a baking sheet in a 375-degree oven. Heat until warmed through and  crisped, 8 to 10 minutes if refrigerated, 16 to 20 minutes if frozen. 

To Make Ahead: After placing the scones on the baking sheet, either refrigerate them overnight or freeze. When ready to bake, for refrigerated scones, heat oven to 425 degrees and follow directions in step 7. For frozen scones, heat oven to 375 degrees, follow directions in step 7, and extend cooking time to 25 to 30 minutes.