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Jello Fondant

How to make delicious Jello Fondant. from #DietersDownfall.comMermaid Inspired Cake – Day Two – Jello Fondant

There are two very special little girls that celebrated a mermaid pool party last week. Their mom asked me to make an intricate fondant mermaid and there was no way that I could do that. No. Way!

Kneading Fondant may be a tough job, but it's worth the work. from #DietersDownfall.comI talked her out of an elaborately decorated cake that I could in no way deliver in favor of a more simple design.

Then I came across this tutorial on Instructables and thought it would be perfect for the cake.

We decided on lime green and berry blue for the colors and I went with it.

Lime Jello Fondant and Berry Fondant with tools to make mermaid scales. from #DietersDownfall.comThe jello flavored and colored the marshmallow fondant beautifully. I love how this turned out! It’s easy to make and it was yummy to eat.


Yield: 16

Jello Fondant

Jello Fondant

This easy marshmallow fondant is flavored and colored with jello.

Prep Time 30 minutes
Total Time 30 minutes


  • 1 (10 oz) bag of mini marshmallows
  • 1 (3 oz) box of jello
  • 2 tablespoons water
  • 1 pound powdered sugar
  • shortening


    1. Place the marshmallows, jello, and water into a glass bowl. Microwave for 30 seconds at 50% power and stir. Microwave again and stir completely.
    2. Gradually add in 1/4 of the powdered sugar and give it a good stir. It will be thick and sticky, but keep stirring. Add in a bit more sugar and when it gets too thick to stir, then transfer it to a silicon mat that’s coated in shortening.
    3. Knead more sugar in until it no longer sticks to your hands. You may not use all of the sugar or you may need to add a bit more sugar; it all depends on how thick you want your fondant.
    4. Once it’s at a thickness and consistency of play-doh, it’s done.
    5. To store your fondant, add some shortening to your hands and rub it over the fondant, wrap it with plastic wrap and then place it into a sealed bag, preferably one with a vacuum seal. Let your fondant sit overnight.


Recipe from Instructables

Nutrition Information:



Serving Size:


Amount Per Serving: Calories: 124Total Fat: 1gSaturated Fat: 0gTrans Fat: 0gUnsaturated Fat: 0gCholesterol: 0mgSodium: 7mgCarbohydrates: 30gFiber: 0gSugar: 29gProtein: 0g

Nutrition information isn’t always accurate.


Thursday 11th of March 2021

I'm making my son's wedding cake andhe wants a key lime cake, but doesn't like store bought fondant. So glad I came across this recipe!

Karyn Granrud

Tuesday 16th of March 2021

This is such a good fondant recipe. Yes, store-bought fondant is bland and gross, but this jello fondant stays soft and tastes wonderful. If the lime flavor is too much, you can simply use half the box and replace the water with key lime juice. Good luck with the wedding planning!

Den Smith

Wednesday 14th of March 2018

What about using the marshmallow creme? It's already in a melted like stage. Same goes with strawberry flavor marshmallow creme!

Karyn Granrud

Monday 26th of March 2018

I've tried using marshmallow creme for another project and it just didn't harden up right. I think it would stay way too soft.


Monday 10th of July 2017

So I have read a couple of these recipes and they all list a little water as an ingredient. None of them mention using it in the instructions. Where is the water used?

Karyn Granrud

Monday 10th of July 2017

It's in the first line of the instructions. You add the water to the marshmallows when you go to melt them. It adds a bit of moisture to mix. Hope that helps.


Saturday 28th of May 2016

Hi, I'm in the uk, do you know where I can get jello?

Karyn Granrud

Monday 30th of May 2016

Flavored jello is just flavored gelatin. In the UK I believe you buy it in sheets.

debbie copa

Wednesday 27th of May 2015

how long can the fondant pieces be stored after making them.

Karyn Granrud

Friday 5th of June 2015

I generally have kept the fondant whole for a day and then used the pieces when they were cut. Then I've left them on the cake for another day or two. The marshmallow fondant doesn't get hard, but it will dry out and get brittle.

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