Preheat the oven to 400 degrees F. Line a baking sheet with parchment paper.
Mix all of the dry ingredients (flour, brown sugar, baking powder, baking soda, salt, powdered ginger, and candied ginger) together in a bowl.
In a separate small bowl mix together the sour cream, whipping cream, egg and vanilla extract with a fork until combined.
Cut the cold butter into small pieces - I generally cut the butter stick in quarters and then cut those into little pieces 1/4 inch or smaller.
Add the butter pieces to the flour mixture and use your fingers or a pastry blender to work the butter pieces into the flour, making sure each piece is coated in flour.
Add the cream and egg mixture to the flour and butter mixture and stir with a spoon until just combined.
Add the diced peaches and gently mix with your hands until just combined, trying not to handle the dough too much.
Place the dough on a floured surface and gently pat into an 8-inch round shape. With a knife, cut the dough into 8 wedges.
Transfer the wedges to the parchment-lined baking sheet and sprinkle the scones with the Turbinado or granulated sugar.
Bake for 14 to 18 minutes until golden brown.
Cool for 10 minutes on a wire rack before eating.