Cut brownies without the crumbs! There’s nothing worse than pulling out a pan of perfect-smelling brownies only to destroy the entire pan when it comes time to slice. For perfectly square, clean-cut brownies (or other bars) grease a baking pan, line it with two strips of parchment (one from left to right, one from front to back), and grease the parchment paper too. Once cooked, let sit until cool to the touch. Once cooled, use the parchment paper edges to lift the brownies from the pan. Then slice with a serrated knife.