This one feels sneaky, like a kitchen cheat code. Fill your kitchen sink with one inch of cold water. Seriously, just a shallow puddle, not a swimming pool.
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Place the entire hot brownie pan (make sure it's metal or ceramic, not glass!) into that shallow water. Let it sit for about 2-3 minutes. The water will pull heat directly from the bottom and sides of the pan.
Dry the bottom of the pan with a towel before setting it on your counter. You'll feel the difference immediately. The pan will be cool to the touch, and the brownies will be set enough to cut perfectly.
A word of warning here
This method is speedy but requires attention. If you leave the pan in the water for more than five minutes, you risk cold, soggy edges. Nobody wants a brownie with a wet bottom.
It's like dipping your hot toast into a glass of ice water for a second. A quick dunk is refreshing. A long soak is just sad and damp. Be brave, be fast, be the brownie master.