
Whisk flour, baking powder, sugar, and salt. Cut in cold butter until pea-sized crumbs form — don't over-mix.
Add cold buttermilk and stir until just combined. Turn onto a floured surface, fold 3-4 times for layers.
Pat to 1-inch thickness. Cut with a 2.5-inch biscuit cutter — press straight down, don't twist.
Place biscuits in the basket with space between them. Air fry at 330°F for 10-12 minutes until tall and golden.
Brush tops with melted butter and sprinkle with flaky salt immediately.
Tip: Cold butter and cold buttermilk are non-negotiable — they create steam pockets that make the layers. Twisting the cutter seals the edges and prevents rising.
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