Preheat Air Fryer: Preheat your air fryer to 350°F (175°C). This should take just a few minutes.

Arrange Biscuits: While the air fryer is preheating, arrange the leftover biscuits in a single layer in the air fryer basket. Ensure that there's some space between each biscuit for even heating.

Start the Air Fryer: Once the air fryer is preheated, place the basket with the biscuits inside. You don't need to add any oil or cooking spray.

Set Temperature and Time: Set the air fryer to 300°F (150°C) and cook the biscuits for about 3-5 minutes. Keep an eye on them, as the exact time may vary depending on the size and thickness of your biscuits and the specific air fryer model.

Check Progress: Check the biscuits after a few minutes. They should be warmed through and slightly crispy on the outside. If they're not warm enough, continue cooking in 1-2 minute increments until they reach your desired temperature.

Remove and Serve: Once the biscuits are warmed to your liking, carefully remove them from the air fryer using tongs or a spatula.

Serve: Serve the warm biscuits immediately with your favorite toppings or enjoy them as a side dish.