This is my spin on America's Test Kitchen's famous drop biscuit recipe, but I use a little more sugar, and salted butter. I also make these as vegan biscuits using soy milk & lemon juice and Miyoko's vegan butter.
Make sure your oven rack is set in the middle, then preheat oven to 475F. Have ready a parchment lined baking sheet, a toaster oven tray or a small cast iron skillet.
In a mixing bowl, stir together the flour, baking powder, baking soda, sugar and salt.
Add the cooled melted butter to the ice cold buttermilk, then pour it over the dry mixture, stirring with a heavy duty rubber scraper until batter is lumpy and pulls away from the bowl.
Drop four equal size balls of dough onto the pan or skillet.
Bake until golden brown and cooked through -- about 15 minutes or until tops are golden brown. Brush tops with some extra melted butter. The timing may vary slightly from oven to oven.