Cook the donuts in the air fryer at 330°F for 8-10 minutes. They will be a little more biscuit-like on the exterior so I like to cover them in a cinnamon glaze instead of cinnamon sugar. Mix together 2 cups of confectioner's sugar, 1 teaspoon vanilla extract, 2-3 tablespoons of milk, and 1/2 teaspoon cinnamon to make the glaze.