Preheat your air fryer to 350°F (175°C) for about 5 minutes.

In a medium mixing bowl, whisk together the all-purpose flour, baking powder, baking soda, salt, and sugar until combined.

In another bowl, beat one egg and mix in the cottage cheese, vanilla extract, and melted butter until smooth.

Gently fold the wet ingredients into the dry mixture using a spatula until no dry flour is visible.

Fold in the blueberries carefully, ensuring they remain intact.

Lightly grease your mini muffin pan or silicone cups and fill each cavity about 3/4 full with the batter.

Air fry at 350°F (175°C) for 8-10 minutes, or until golden brown and a toothpick comes out clean.

Let the donut holes cool slightly on a wire rack before dusting with powdered sugar and serving.