This is my go-to move. First, get your pan out of the hot oven immediately. Place it on a wire rack or a couple of wooden spoons so air can circulate underneath.
Next, take a big, sharp knife and slice the entire pan of brownies while they're still warm. Don't lift them out, just cut clean through. This releases steam from all those new edges.
Finally, pop the whole pan into the freezer for exactly 15 minutes. Set a timer! This isn't a science project, but don't forget it. After a quarter of an hour, they'll be perfectly firm to the touch but still wonderfully soft inside.
Why this works (the simple version)
Freezing draws heat out about ten times faster than just sitting on the counter. It's like giving your brownies a very short, very cool vacation. The short chill firms the butter and chocolate, making that first slice come out clean as a whistle.
Think of it like a cold shower after a long run. It's a shock to the system, but it gets the job done quickly. Your brownies will thank you by not falling apart.
