Mashed the banana until smooth.
Stirred in flour, brown sugar, and vanilla until combined.
Kneaded lightly with greased hands until soft and slightly sticky (like pizza dough).
Rolled into golf ball-sized pieces.
Placed on parchment, sprayed lightly, and air fried in Frittaire at 350°F for about 8 minutes, flipping halfway.
Mixed sugar, cinnamon, and cardamom.
Brushed each donut hole with melted butter, then rolled in the sugar mixture.
Served warm. Soft inside, sweet and spiced on the outside.
