January 11, 2013

DIY Marshmallow Fondant: Part II

This post originally appeared on my first blog, Amy's Cooking Adventures, in May of 2012.

To see the first part of this series (DIY MM Fondant), click here.

Decorating with Marshmallow Fondant

If you missed the tutorial on how to make MM fondant, check it out here.

Now that the fondant is all colored and ready to go, we need a cake.   This amount of fondant will easily cover an 8, 9, or 10 inch cake with some to spare.  If you are covering a tiered cake (let’s say an 8-inch and a 6-inch cake) you will likely need an additional half batch of fondant.  

Today I’m decorating an 8-inch square cake.

First of all, cover your cake with buttercream, at least 1/8 inch thick (ignore all the crumbs on my cake – it was a new recipe that turned out to be rather crumbly – good thing I was planning on covering it with fondant!)

Now it is time to measure your cake.  Even if you know your pan sizes (my cake is two 8x1.5 inch square layers stacked on top of one another), always measure with a ruler to verify (my ruler is pretty snazzy, eh?). 

In this case, my cake is 3 inches tall by 8 inches wide.  Now it is simple mathematics.  Always (for square or round cakes) take your width and add the height twice (or W + 2H).  For my cake this looks like: 8 + 3 + 3 = 14. 

Therefore, when I am rolling out my fondant, I need it to be at least 14x14 inches (I roll out a large circle regardless of the shape of my cake.  And it is not usually perfectly circular, more nodular).  I usually add an additional inch or two, just to be on the safe side.  For this cake, I actually rolled out a 16x16 inch circle, about 1/8 inch thick.

I always roll out my fondant on a thin fondant rolling mat that has been very lightly dusted with corn starch.  It is marked with sizes and is flexible enough to be flipped directly onto the cake and peeled off. 

If you do not have a mat that can be used for this purpose, dust the surface of the fondant with corn starch and gently roll the fondant onto a rolling pin, carefully unrolling the fondant onto the cake.  Also use this second method if you need to roll the fondant larger than your rolling mat. 

If you notice any air bubbles as you roll, insert a toothpick into the bubble and press down on the bubble to release all the air.  Continue rolling as usual.

Using the palms of your hands or a fondant smoother, gently smooth the fondant over the top of the cake, starting at the center and moving to the edges.

Then move to the sides.  Smooth the fondant along the sides of the cake, taking care that the fondant is flush against the cake, especially near the bottom.  

At times, the fondant may wrinkle (this will specifically happen at the corners on a square cake, but will occur on round cakes as well).

To remove the wrinkle, gently pull and stretch the fondant to cover the area and smooth down.

Use a sharp knife or pizza cutter dusted in corn starch to cut away the excess fondant.  Smooth down the sides with a fondant smoother.

Now the cake is covered!  

Add any details and borders using fondant or buttercream.

Check out these other cakes that were decorated with Marshmallow Fondant:
-Wall-e Cake
-Zebra Stripe Wedding Cake
-Xylosaurus Cake
-Beautiful Bow Cake
-Modern Circle Cake
-Pretty in Pink Cake


  1. Great job on your tutoral, Amy! Thanks for sharing at Foodie Friends Friday Linky Party. Please link back to the party, Foodie Friends Friday Thanks please stop back and vote Sunday and have a great weekend!

  2. So cool! I am so enjoying your new blog. It's so inspiring! Thanks for sharing at Pinworthy Projects!

  3. This tutorial gives me hope to one day make a good looking cake! I will try this one for sure :)
    Thank you for sharing this at Wednesday Extravaganza - can't wait to see the deliciousness you share this week :)

  4. I can't find mini marshmallows in a 16 oz bag. They are all 10 or 10.5 oz size

    1. Hi Maggie - I've found that not all stores carry the 16 oz size, unfortunately. If you are able try the grocery stores, Target, & Walmart in your area.

      Your second option would be to buy two smaller bags and use a food scale to measure out 16 oz of marshmallows.

      Last, the third option would be to cut down the recipe slightly. Use 10.5 oz of marshmallows, about 1 1/2 tbsp of water, and start with 4 cup powdered sugar, adding more powdered sugar as necessary to get the kneadable MM fondant.


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