Preheat oven to 400 degrees. Combine all the dry ingredients with a whisk. In another bowl, whisk together the buttermilk, egg, oil, and vanilla. Blend the wet mixture into the dry mixture. By hand, add in the blueberries (freezing first, works best) and gently knead the dough 5 or 6 times to mix in the berries. Spray a 15 x 10 x 1 inch baking pan with cooking spray and place the dough ball in the center. Mash the dough into a flat disc 1 inch in height. Whisk the second egg and sugar together well and brush the egg glaze over the entire tip of the patty of dough. Use a sharp knife to cut the dough into 8 pie wedge pieces. Move each piece to separate them at least 2 inches apart. Bake for approximately 16 to 22 minutes. The scones are done when they are a golden brown color. Serves eight.
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