Recipe · No glue

Edible marshmallow slime

A slime that stretches with no glue and no boron, made with marshmallows, oil, and cornstarch. The recipe, heating time, and safety tips for little ones.

By the Slime & Co editorial team · Updated

A bowl of white marshmallows
Photo: Rebecca Freeman on Unsplash.

This slime is made with kitchen ingredients: marshmallows, a little oil, and cornstarch. It stretches and molds like slime, with no glue and no activator. It’s called “edible” because the ingredients are, but it’s still made for playing, not for snack time.

The tricky step is heating: melted marshmallows get very hot. That’s the adult’s job.

Ingredients

Supplies: a microwave-safe bowl, a spatula.

Steps

  1. Put the marshmallows and oil in the bowl.
  2. An adult microwaves them for about 30 seconds on full power (the time depends on the microwave): the marshmallows puff up and soften.
  3. The adult stirs with the spatula and adds ½ tbsp of cornstarch (and the food coloring).
  4. Wait until the dough has cooled before touching it.
  5. Knead with hands dusted in cornstarch; add another ½ tbsp of cornstarch if it’s sticky.

How do you know it worked?

It’s ready when it stretches without sticking to your fingers. It hardens once it cools completely: this is a slime to use right away.

The most common slime fails

It’s super sticky
Still warm, or not enough cornstarch: wait, then add cornstarch in small amounts.
It got hard
It cooled down. A few seconds in the microwave (by an adult) softens it, but check the temperature before handing it back.

Why does it work?

Marshmallows contain sugar and gelatin (or another gelling agent). When heated, the gelatin melts; as it cools, it sets again and forms a stretchy network, which is what lets it stretch.

Variations and ideas

How to store it

Use it the same day. It hardens and gets sticky afterward: throw it out.

✅ I made it! Add it to my logbook

Try these too

All recipesIngredients explainedSlime Birthday Party: The Game Plan for 8 Kids