Wait until they have completely cooled and you can enjoy a clean, even cut to make your tray of brownies look neat. Moreover, the texture of each cooled one is a bit more firm and solid, making it easier to eat than when the brownies are warm and crumbling with each bite.

Do brownies firm up when cooled?

See where we're going here? Those chocolate brownies — which happen to be chock-full of cocoa butter — might be fine right out of the oven, but once they cool, they can turn dry and hard.

Why do my brownies get hard after cooling?

Don't Refrigerate!

You'll end up with hard and dry brownies just a couple of hours after refrigerating. The reason for this? At low temperatures the sugar in the brownies will start to harden and crystallize, making the brownies hard and crunchy.