Preheat your oven to 375 degrees Fahrenheit and line a baking sheet with parchment paper. In a large bowl, whisk together the flour, baking powder, baking soda, sugar, and salt.
2 cups all purpose flour, 2 teaspoons baking powder, 1/2 teaspoon baking soda, 1 teaspoon sugar, 3/4 teaspoon salt
In a smaller bowl, whisk the cold buttermilk and melted butter. It will start to clump together as the cold buttermilk drops the temperature of the butter.
1 cup buttermilk, 8 tablespoons unsalted butter
Stir the liquid into the dry ingredients just until it starts to pull away from the side.
Using a well-greased 1/4 cup measuring cup, scoop the batter and drop just less than a quarter cup of batter onto the baking mat, keeping an inch and a half between biscuits. You may have to bake them in 2 batches.
Bake for 12 to 14 minutes until they are golden brown. Remove the biscuits from the oven and brush with butter if serving right away. Serve warm.
2 tablespoons butter