Maple Blueberry Scones

Name: Maple Blueberry Scones
Ingredients: 3 cups all-purpose flour; 2 1/2 teaspoons baking powder; 1/2 teaspoon baking soda; pinch of freshly grated nutmeg; 3/4 teaspoon salt; 3/4 cup cold unsalted butter, but into small cubes; 1 large egg, lightly beaten; 2 tablespoons pure maple syrup; 3/4 cup cold buttermilk; 1 cup fresh blueberries (you can used thawed and drained berries from the freezer although the scones will have a more purple color); 3 tablespoons buttermilk for brushing the tops of the scones before baking; granulated sugar for sprinkling on top before baking