Heat oven to 475. Used baking sheet lined with parchment.
Whisk flour, baking powder, baking soda,sugar and salt in large bowl.
Combine buttermilk and 8 Tablespoons melted butter in a medium bowl. Stir until butter forms small clumps.
Add buttermilk mixture to flour mixture and stir with rubber spatula until just incorporated.
Use a greased 1/4 cup dry measuring cup. Scoop out level amount and drop onto parchment. Leave 1 1/2 inches between biscuits.
Bake for about 12-14 minutes or until tops are golden brown and crisp.
Brush with remaining butter. Let cool 5 minutes before serving.