Combine the flours, peanut butter powder, sugar, baking powder, baking soda and salt.
Whisk together the buttermilk, oil and egg. Pour into the flour mixture and stir until just combined. Knead the mixture a few times until a uniform dough forms.
Flatten the dough into a 1 inch thick disk. Use a cookie cutter to cut out scones, then place on a baking sheet lined with parchment paper. Combine the dough scraps and continue to cut out scones until all the dough is used.
Brush the scones with buttermilk, then sprinkle them with sugar.
Bake 10 minutes, until golden. Cool on a wire rack. Enjoy!