1. In a container, mix the flour with the yogurt and baking powder until you get a homogeneous dough.
2. Form cylinders and join the ends forming the donuts.
3. Brush with a little vegetable oil and transfer them to the air fryer.
4. Cook for 9 minutes at 180ºC/350°F.
5. Meanwhile, place the sugar, cinnamon, margarine, and coconut oil in a bowl.
6. Mix very well until completely integrated.
7. Remove the donuts, transfer them to a plate and pour the topping over them, trying to cover completely.