In a medium mixing bowl, add sugar, baking powder, baking soda, and salt. Mix well. cut in butter with using a knife, or pastry blender until mixture is course.
Combine yogurt and dried peaches to flour mixture and stir until just moist.
Put dough on a lightly floured surface. Knead approx 5 times lightly.
Spray a baking sheet with cooking spray, Place dough on cookie sheet
Form dough into a 5 inch circle by patting. Cut dough into 4 wedges. Separate to make room for baking.
Brush scones with milk and sprinkle 1 tsp of sugar on top.
Bake in preheated oven 14 minutes, or until golden brown.