Gather your tools and ingredients. Make space in your refrigerator or freezer to hold your pan or two plates level.

Stir the green icing to help soften it.

Place parchment paper on the baking sheet.

Unwrap each treat and lay them out on the sheet.

Using a butter knife or offset spatula, use the green frosting to frost just the tops of each krispie treat. Set aside. 

Gently massage the black writing gel with the cap on. Set aside. 

Unravel a twizzler so that it separates into segments for the lips (see photos).

With the cutting board and knife (a butter knife should cut the twizzlers fine if you want to pass this task to your child), cut approximately 1-inch lengths of Twizzler segments. Set aside.

Assemble the eyes, if using, or use the black gel to start drawing on two eyes, nose, and hair at the top of each treat. (See photos.)

Add the “lips” last, pressing each 1-inch segment under the nose. Don’t stress if something isn’t going on right. He’s a monster, after all. 

If there isn’t enough room in your fridge, carefully transfer the “monsters” to two plates so the black icing will set, as it tends to run. Leave for about half an hour undisturbed in the fridge or 10 minutes in your freezer.