Directions

1. Adjust an oven rack to the middle position and heat the oven to 475 degrees. Line a large rimmed baking sheet with parchment paper. Whisk the flour, baking powder, sugar, salt, and baking soda together in a large bowl. Combine the buttermilk and 8 tablespoons of the melted butter in a medium bowl, stirring until the butter forms small clumps.
   
2. Add the buttermilk mixture to the dry ingredients and stir with a rubber spatula until just incorporated and the batter pulls away from the sides of the bowl. Using a greased 1/4‑cup measuring cup, scoop a level amount of batter and drop onto the prepared baking sheet. Repeat with the remaining batter, spacing the biscuits about 1 1/2 inches apart. Bake until the tops are golden brown and crisp, 12 to 14 minutes.
   
3. Brush the biscuit tops with the remaining 2 tablespoons melted butter. Transfer to a wire rack and cool 5 minutes before serving.