A delicious edible slime recipe, this Edible Birthday Cake Slime is made with tasty marshmallows and sprinkles! A 4-ingredient edible slime your kids will love stretching, squishing and eating!

Edible Cake Slime Recipe

My daycare kids go crazy when I make slime so I’ve tried to start making only edible slime with them so that even our youngest kids can get in on the sensory play. (We’re Canadian so the youngest is over 1 year old. I had to clear that up on my edible honey slime post…) It’s not about making edible slimes as a “snack” – it’s about providing a safe alternative to a glue-based slime for a variety of ages and developmental stages. 

Recently, we had a daycare kid celebrating a birthday and he is by far the biggest slime fan in the group, so I thought instead of making cupcakes to celebrate, I would make an edible birthday cake slime! I knew that he’d love it more than actual birthday cake – and ironically, I find my kids don’t really eat a ton of the edible slimes, they just take a couple curious nibbles and continue playing, so this actually would result in less sugar intake than if I had made cupcakes!

So, the night before his birthday, Ella and I set about to experimenting for the perfect “birthday slime.”

We wanted it to have a vanilla taste and lots of birthday sprinkles. I couldn’t think of any candy with a vanilla taste (we’ve done Gummy Bear Slime and Edible Starburst Candy Slime) but we always add a lot of vanilla to our homemade marshmallow fondant recipe which was the inspiration behind our Peeps Airdry Clay, so I figured it was worth trying to make a marshmallow slime!

This slime is stickier than our other edible slimes… it is made with marshmallows after all! To counter the slime sticking to our hands, we just rubbed a little bit of oil on them and it worked perfectly. (You can see in the video that it wasn’t sticking everywhere.)

This cake slime is great for squishing and stretching, but it’s a bit “tougher” than a regular glue-based slime. It doesn’t drip or rip apart easily, which also has the bonus of not being messy.

And of course, the taste!

This birthday cake slime has a pleasant vanilla taste but you could use whichever flavor extracts you have on hand or you could also use flavored marshmallows to make a different “cake” flavor. Chocolate marshmallows, strawberry marshmallows – I’ve even seen maple marshmallows in the summer. (Super yummy on s’mores, too!)

This is an edible slime recipe to just have fun with – let the kids grab toys from the play kitchen and empty out the last of your holiday sprinkles. My daughter and my daycare kids had a blast playing with this and that’s way more important than worrying about them using up all the rainbow sprinkles!

Watch our video to see how to make this easy edible marshmallow slime – and also see it in action getting played with! And then don’t forget to scroll down to grab your free recipe printable to make this edible slime yourself:

If you’re looking for the ultimate slime guide – you need to check out our Slime Book with over 40 amazing, unique slimes:

You can purchase The Slime Book on Amazon, Book Depository, or at your local bookstore!

(Read more about The Slime Book and what it contains here.)

Ingredients for Edible Marshmallow Slime

• Marshmallows
• Vegetable Oil, as needed
• Vanilla Extract, or other “cake flavor”
• Powdered icing sugar, as needed
• Sprinkles, as desired

Scroll down to the printable recipe card for full measurements.

Tip: you may need extra icing sugar or oil – my daughter liked oiling her hands for this slime recipe so that it never stuck to her.

Kitchen Tools You May Find Helpful

• Microwave
• Mixing bowl
• Spatula
• Measuring cups and spoons
• Cutting board (for kneading)

Don’t forget to also grab some fun play kitchen items to play with the slime – make sure they can be soaked or ran through the dishwasher after playing as they may get messy!

How to Make Edible Cake Slime

Place your marshmallows in a heatproof bowl and microwave in 25-second bursts to melt fully. Stir in between reheatings. (It took two rounds of 25-second heatings for ours to melt.)

Stir in 1 Tablespoon oil and your vanilla extract. Taste and adjust, as desired.

Stir and then knead the powdered icing sugar into the slime, 1/4 cup or so at a time. You may need less icing sugar than we used, so it’s better to start with less and work your way up.

Add up to 2 Tablespoons of oil to help the slime regain it’s stretch as you add more icing sugar.

Add your sprinkles, knead in, and then add more.

Have some oil to the side if you decide you want to oil your hands a bit to eliminate any stickiness.

Pin this Edible Birthday Cake Slime recipe:

Grab your free printable instructions for our edible cake slime recipe:

This edible birthday cake slime is a delicious slime made with just 4 ingredients you probably already have in your kitchen! Use flavored marshmallows if you want a chocolate, maple or even strawberry cake slime!

For more delicious and fun edible slime recipes, check out our Edible Honey Slime or our Edible Cranberry Slime.