No Secrets! Hints and Helps: PLASTIC KNIFE Angie 12 years ago NO SECRETS! HINTS AND HELPS: PLASTIC KNIFE. When cutting brownies, bars, or squares use a plastic knife instead of a metal knife for neater cuts! Look at the difference! 🙂 Share this: Share on Facebook (Opens in new window) Facebook More Share on Pinterest (Opens in new window) Pinterest Share on X (Opens in new window) X Print (Opens in new window) Print Email a link to a friend (Opens in new window) Email Share on Reddit (Opens in new window) Reddit Share on Tumblr (Opens in new window) Tumblr Share on LinkedIn (Opens in new window) LinkedIn