
Whisk flour, sugar, and baking powder. Add milk, egg, and vanilla. Mix until just combined.
Pipe or spoon into a greased donut mold. Don't overfill.
Air fry at 350°F for 6-7 minutes until donuts spring back when pressed.
Brown the butter until amber and nutty. Brush over warm donuts, then roll in cinnamon sugar.
Tip: Watch the brown butter closely — it goes from perfect to burnt in seconds. Pull at amber color.
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