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 lumps remain.
03 - Place mug in air fryer basket and cook at 320°F for 7-8 minutes until cake has risen and set. Insert toothpick into center to verify doneness—it should come out clean.
04 - Carefully remove hot mug from air fryer using oven mitts. Let cool 1-2 minutes, then top with whipped cream and fresh berries if desired. Serve warm.