In a large mixing bowl, mix the flour, salt, nutmeg, cinnamon, baking powder, and sugar.
In another mixing bowl, mix the egg, melted butter, and milk.
Mix the wet ingredients into the dry ingredients.
Knead until the dough forms.
Then grease your donut pan with olive oil.
Fill your donut pan up, and then place the pan into the air fryer basket, set the temperature to 320 degrees F, for 7-10 minutes.
Let cool slightly, then roll into melted butter and then into the cinnamon-sugar mixture.
Plate, serve, and enjoy!