In a large mixing bowl, whisk together the flour, sugar, baking powder, salt, and ground cinnamon.
In another bowl, combine the milk, applesauce, egg, and melted butter, stirring until smooth.
Pour the wet ingredients into the dry ingredients and mix gently until just combined. Be careful not to overmix; it’s okay if there are a few lumps.
Preheat your air fryer to 350°F (175°C).
Lightly grease the air fryer basket with non-stick spray.
Scoop the batter into a piping bag (or a zip-top bag with the corner snipped off) and carefully pipe the donut shapes into the basket, leaving space for them to expand.
Air fry for 5-6 minutes or until they are golden brown and cooked through. You may need to fry them in batches depending on the size of your air fryer.
While the donuts are frying, combine the remaining 1/2 cup of sugar with 1 tsp of cinnamon in a shallow bowl for coating.
Once the donuts are cooked, remove them from the air fryer and immediately toss them in the cinnamon sugar mixture until well coated.
Let the donuts cool slightly before serving.
Notes
Arrange the donuts on a decorative plate, and drizzle with a simple icing or serve with a side of fresh fruit for an eye-catching and delicious display.