Indulge in homemade cinnamon sugar donuts made in your Ninja Air Fryer. Prepare a simple donut batter with flour, sugar, baking powder, milk, and melted butter. Pipe the batter into donut shapes and place them in the air fryer. Cook at 350°F for 8-10 minutes until they turn golden brown. Roll the warm donuts in cinnamon sugar for a delightful treat.
