1. In a bowl, combine milk and yeast and let it rest for 10-15 minutes.
2. Mix in 2 eggs and sugar until just combined.
3. Pour the melted butter and stir well.
4. Add in the flour and salt gradually, mix well.
5. Knead the batter for 10 minutes on a floured surface until a smooth dough is formed.
6. Return the dough back into a bowl, cover the bowl with plastic wrap and place in a warm place to let the dough rise and double in size.
7. After the dough has doubled, take it out of the bowl and gently punch it down. Using a rolling pin, roll the dough out onto a lightly floured surface, rolling the dough until it's about 1 inch thick. Cut the dough with a donut cutter.
8. Place donuts (1 inch apart) onto a baking pan that has been sprayed with butter cooking spray. Allow them to rest for 20 minutes.
9. Apply egg wash on the surface of the doughnuts.
10. Preheat the air fryer to 360F. Arrange the donuts on the frying basket (4 or 5 doughnuts at a time) and fry for 5 minutes.
11. Remove the donuts and allow to cool, then glaze your donuts.

Notes: I use melted chocolate and white chocolate, and add sprinkles, chopped almonds, or crushed Oreos on top.