Wanna make a LEGO® birthday cake? Here’s an easy way to make fondant LEGO bricks — both thick and thin fondant LEGO blocks — with no special mold required. It’s fast and easy to crank out a whole bunch of fondant LEGO bricks in a couple hours (and even faster if you purchase colored fondant; I usually buy white fondant and color it myself).
So what do I mean, no special mold needed? Well, if you’ve got a LEGO® baseplate (this post contains affiliate links), then you can easily make your own fondant LEGO bricks with using the baseplate. I saw this trick on pinterest and for the life of me I cannot find it again. The post was in a different language and I had to use Google translate to read it, so if you guys ever see it around please let me know so that I can properly credit it here.
Now I will say this: plastic LEGO baseplates are not officially rated as food safe. If you are super conscious about only using food-safe plastics, then you probably should go ahead and purchase food grade silicone LEGO brick molds. For me, I am OK with using clean, freshly-washed-and-fully-dried LEGO baseplates because it’s on the fondant for just a couple seconds …and honestly I believe that the sugar and dye is probably just as bad for kids if not worse. But birthdays are special once-a-year treat days, so that’s my rationalization. And now back to making fondant LEGO bricks…
This year BOTH of my kids had LEGO-themed birthday parties so I got a lot of practice making fondant LEGO building bricks in all shapes, sizes and thicknesses. I’ll show you how to make both thick fondant LEGO bricks like the ones I made for Liam’s birthday cake…
…and thinner LEGO bricks like these pastel fondant LEGO bricks for Elise’s LEGO Friends birthday cake — I made an 8-shaped cake and put fondant LEGO bricks on the sides and top.
Supplies for making a edible fondant LEGO bricks for LEGO birthday cakes and cupcakes (with links and images from affiliates)
- White fondant – 2 lbs (Fat Daddio’s fondant tastes the best)
- Good food coloring, set of 12 icing colors
- Or pre-colored fondant – yellow fondant, blue fondant, green fondant, red fondant
- Fondant rolling pin
- Sandwich bags (optional if using food coloring)
- Freezer paper
- LEGO® baseplate
- Good kitchen knife
- Plastic wrap
How to make a fondant LEGO bricks for LEGO birthday cakes and cupcakes:
Start by washing your LEGO baseplate with soapy water and a scrub brush and letting it dry absolutely completely, like overnight. Be sure there’s no dish towel fuzz on the clean base plate.
Line your kitchen counter with freezer paper. You need to work with fondant on a super-clean surface to avoid picking up little crumbs and gross fuzz on your fondant. I line my table with freezer paper and tape the edges with blue painter’s tape to keep it in place.
Color your white fondant using food coloring. I put a little bit of gel on a toothpick and stick it into the white fondant. I like to put my hands inside sandwich bags to keep the food coloring off of my hands, and then I pull and knead it back and forth like taffy – see my fondant-taffy-pulling in my Magic Treehouse birthday cake.
To make DIY *thick* fondant LEGO bricks:
To make brick-like LEGO blocks, choose a couple of board books that are the same height. Using books will ensure that all of your fondant LEGO bricks are the same height. Put your rolling pin on top of the books…
And roll that fondant flat and thick…
It will look like this…
Now, grab your squeaky clean and totally dry LEGO baseplate. Evenly press it down onto the top of the fondant.
Now cut into assorted size fondant LEGO bricks.
You can make the bricks a day or two in advance. Just put them on a clean ceramic tray and wrap them tightly with plastic wrap to keep the air from drying them out.
To make DIY *thin* fondant LEGO bricks:
Do the same technique as above, yet roll the fondant out thinner – no books needed. I used thin bricks on the side of Elise’s LEGO Friends birthday cake.
To make DIY fondant LEGO baseplates:
Use the teeniest bit of black food coloring to tint your white fondant gray. Seriously, use just a little bit. You can always add more but it’s harder to add white to make it lighter again. Roll out your fondant to about 1/8″ thick.
I like to my rolling pin when making fondant base plates to make sure that it hits all surfaces (please ignore my old-lady crumpled hands here).
Push down any super tall nubs with your fingers. Then cut your fondant base plate to size.
And that’s it! You can use your fondant LEGO bricks to make DIY LEGO birthday cakes and LEGO cupcakes.
Be sure to pin how to make fondant LEGO bricks for later.
And check out more LEGO birthday ideas.
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Copyright stuff: You’re more than welcome to use this free project and tutorial for personal use. Contact me for commercial use and etsy sales.