Place the flour, sugar, cocoa powder, salt and cinnamon in your microwave-safe mug. Mix with a fork until you get a sandy texture with no clumps.

Integrate the oil with a fork until a paste forms.

Pour in the milk and vanilla, then give it a good stir. The batter might seem a bit runny, but no worries, it's supposed to look that way.

Microwave the mixture, uncovered, at full blast for a minute. When done, your brownie should appear somewhat moist; it's alright to have a few wet spots. Those will firm up during the resting period.

Let the brownie cool its heels for 4 minutes. It's still cooking inside, so curb your impatience. The flavour and texture are worth the wait.

Crown your masterpiece with a scoop of vanilla ice cream or some skooshy cream. Then dig in.