How to make it
5 steps. Tap one when it's done.
No tray, no waiting for a whole batch, nothing to wash but a mug and a fork. The trick is pulling it out while the middle still looks unfinished.

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Lifting the mug out — it gets much hotter than the brownie inside it
5 steps. Tap one when it's done.
A microwave heats the water inside the batter, not the mug. Once that water boils away the crumb has nothing left to keep it soft, which is why twenty extra seconds is the difference between a brownie and a hockey puck.