In a mixing bowl, whisk together 2 cups of all-purpose flour, 2 ½ teaspoons of baking powder, and ½ teaspoon of kosher salt until well combined.
Add 6 tablespoons of cold, cubed salted butter to the flour mixture. Using a pastry cutter or fork, cut the butter into the flour until the mixture resembles coarse crumbs.
Pour in ¾ cup of cold buttermilk and stir gently until the dough comes together. Be careful not to overmix; a little bit of lumps is okay.
Turn the dough out onto a lightly floured surface. Gently knead it a few times until it holds together. Pat it into a rectangle about 1 inch thick.
Using a biscuit cutter or a glass, cut out circles from the dough. Place them on a piece of parchment paper or directly into your air fryer basket.
Preheat your air fryer to 320°F (160°C). Air fry the biscuits in batches for about 10-12 minutes, or until they are golden brown on top.
Once done, remove the biscuits from the air fryer and brush the tops with 2 tablespoons of melted butter for that luscious finish.
