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Preheat your air fryer to 350°F (175°C) for about 3-5 minutes.
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Remove the biscuits from the can and separate them. Use a small round cookie cutter or the cap of a water bottle to cut out the center of each biscuit to create the donut shape. You can also use your fingers to gently stretch out the center of each biscuit.
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Brush both sides of the biscuit donuts with melted butter.
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In a shallow bowl, mix together the granulated sugar and ground cinnamon.
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Dip each buttered biscuit donut into the cinnamon-sugar mixture, coating both sides evenly.
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Place the coated donuts in the air fryer basket in a single layer, making sure they are not touching each other. You may need to work in batches depending on the size of your air fryer.
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Air fry the donuts at 350°F (175°C) for 4-5 minutes on one side, then flip them over and air fry for an additional 2-3 minutes on the other side, or until they are golden brown and cooked through.
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Once the donuts are done, remove them from the air fryer and let them cool slightly on a wire rack.
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If desired, you can top the donuts with powdered sugar, chocolate glaze, vanilla glaze, sprinkles, or any other toppings of your choice.
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Serve the air fryer donuts warm and enjoy