Clean any dirt from the mushrooms, and slice them in half.

Trim the stem end of the mushroom so that it’s straight and flat.

Use a plastic or metal straw (don’t use paper) to poke two eyes into the mushroom. The straw can be any size, it doesn't matter, you’ll just end up with bigger or smaller eye sockets. Use a boba straw for really big eyes. Remove any pieces of mushroom left in the eye socket. I found they came out easily by twisting the straw a little after you’ve inserted it.

Use a small knife to cut two small slits for the nose. Remove any pieces of mushroom left in the nose slits. You can also make a triangle in the middle for the nose, which ends up looking a little like a jack-o-lantern.

Cut a few lines down the stem of the mushroom to make the teeth.

Preheat the oven to 375° F.

Place the mushrooms, cut side down, on a parchment paper lined baking sheet.

Bake for about 15 minutes, or until skulls look a little shriveled.