Preheat your oven or air fryer to 350°F (175°C) and line a baking sheet with parchment paper.

Mash the bananas in a mixing bowl until smooth, then stir in the vanilla extract.

Add flour and baking powder to the banana mixture and gently mix until a cohesive batter forms.

Transfer dough to a floured surface, knead lightly, and divide into 9-12 equal portions, rolling them into balls.

Place the donut holes on the prepared baking sheet and lightly spray with oil.

Bake for 6-8 minutes until puffed and golden brown.

Mix sugar and cinnamon in a shallow bowl while the donut holes bake.

Remove baked donut holes, let cool briefly, then toss in the cinnamon sugar mixture until coated.

Serve warm or cooled; perfect as a snack or dessert.