Whisk together all dry ingredients in a large bowl.
In a separate bowl, whisk together buttermilk, egg, melted butter, and vanilla.
Pour wet ingredients into dry; stir until just combined. A few lumps are fine.
Let batter rest for 5 minutes.
Preheat air fryer to 320°F (160°C).
Generously grease a 6-inch aluminum cake pan or silicone mold.
Pour about ⅓ cup of batter into the prepared pan.
Air fry at 320°F for 6-8 minutes, until a toothpick comes out clean.
Remove carefully, regrease the pan, and repeat with remaining batter.
Serve warm with butter, maple syrup, and your favorite toppings.