01 - Lightly coat a microwave-safe mug with nonstick cooking spray
02 - Combine the angel food cake mix and water in the prepared mug. Stir thoroughly until completely smooth and well incorporated
03 - Place the mug in the air fryer basket and cook at 320°F for 7 to 8 minutes, or until the cake has risen and set in the center. Insert a toothpick into the center to verify doneness—it should come out clean
04 - Carefully remove the hot mug from the air fryer and let cool for 1 to 2 minutes. Top with whipped cream and fresh berries if desired, then serve immediately