01 - Lightly coat a microwave-safe mug with nonstick cooking spray to prevent sticking.
02 - Combine angel food cake mix and water in the prepared mug. Stir thoroughly until completely smooth and no dry pockets remain.
03 - Place mug in air fryer basket. Cook at 320°F for 7 to 8 minutes until cake has risen and center is set—test with toothpick for doneness.
04 - Carefully remove hot mug from air fryer. Let cool 1 to 2 minutes, then top with whipped cream and fresh berries if desired. Serve immediately.