In a large mixing bowl, combine self-raising flour and sweetened Greek yogurt, mixing until a soft, cohesive dough forms. Knead gently for 1-2 minutes until the texture is smooth.

Divide the dough into portions weighing around 8-12 grams, rolling them into neat balls. Place on a lightly floured surface.

Preheat your air fryer to 350°F (180°C) for about 5 minutes. Lightly oil the basket, then place the donut balls in a single layer. Air fry for 5 minutes, monitoring for golden color.

Once golden brown, remove the donut bites while warm. Toss in melted butter, then roll in a mixture of granulated sugar and ground cinnamon.

Serve fresh from the fryer on a plate, optionally drizzled with melted chocolate. Enjoy them as a snack or dessert!