01 - Place elbow macaroni, water, and a pinch of salt into a large microwave-safe mug with a minimum 12 oz capacity.
02 - Microwave on high for 3 to 4 minutes, pausing every minute to stir and monitor pasta doneness. Add a small splash of water if necessary to prevent drying.
03 - Add milk, shredded cheddar, cream cheese if using, and ground black pepper to the mug. Stir to distribute evenly.
04 - Microwave on high for 1 minute, then stir thoroughly until the cheese is fully melted and the sauce reaches a creamy consistency.
05 - Allow the mac and cheese to stand for 1 minute in the mug before serving to finish setting.