This makes a delicious brownie for one in about a minute. I used a 1500 watt microwave. 60 seconds makes a molten center brownie. 75 seconds make a uniformly done brownie. Careful not to overcook.
CHOW.com Copy Chief Deborah Lewis tested two member recipes, Microwave Brownie in a Mug (single serving) and Microwave Chocolate Mug Brownie. She liked the former, as you'll see here.