Sift together flour, baking powder, soda, salt, and 2 teaspoons sugar in a bowl
Blend in butter with your fingertips or a pastry blender until mixture resembles slow cooking oatmeal flakes
Stir in buttermilk with a fork until combined; do not over mix
Drop rounded tablespoons of dough over filling, leaving spaces in between to allow topping to expand; sprinkle with remaining sugar
Bake cobbler in middle of oven until fruit is tender and topping is golden, about 60 minutes (watch the browning as it may have to be covered with foil at 30 minutes to prevent over-browning)
Cool slightly, about 15 minutes, and serve warm with vanilla ice cream