Making a themed birthday cake doesn’t have to be hard. Sometimes you just have to think outside the box when picking your design. Many LEGO cake ideas involve either round cakes to simulate LEGO heads or lots of fondants to create LEGO bricks.
Easy LEGO cake idea
Instead of making a cake with lots of LEGO bricks, I decided to make a LEGO cake that was just one extra large LEGO brick. A cake with a lot of detail could be a very frustrating endeavor. So I went simple and big with one giant LEGO brick.
LEGO Cake Recipe
Start by baking your cake in a 1-lb loaf pan. Use your favorite homemade cake recipe or keep it easy and buy a box of cake mix. (Don’t worry I won’t tell). Be sure to spray the loaf pan with cooking spray before pouring the batter. This helps the cake slide out of the pan easier when it’s done.
Once it’s done baking, allow it to cool briefly before dumping the cake out of the pan. Then allow the cake to cool completely before frosting.
LEGO Brick Cake
To make the studs on the top of the LEGO brick, start by cutting marshmallows in half. This makes the marshmallows more proportionate to the height and size of LEGO studs. The cut side of the marshmallow will be slightly sticky making it easy to stick to the top of the LEGO cake.
Use food coloring to create whatever LEGO brick color you want. This is a fun way to theme this cake to any LEGO party theme. For example, making pink or purple frosting would work great for a LEGO Friends birthday party.
LEGO Cake Frosting
I have boys so we kept it to a simple blue frosting. Now you could simply frost the cake and marshmallows with buttercream frosting at this point. That’s what we did the first time I made this cake. It’s a little messy and it wasn’t as smooth looking as I wanted.
The next time I made the cake, I warmed up the frosting first and poured it over the cake. Start by placing the cake on top of a wire rack over a large cutting board or cookie sheet. This will allow you to collect the excess frosting as it drips down the cake.
Melt the frosting in the microwave in 30-second spurts, stirring each time to test consistently. You want it runny, so you can pour it over the cake easily but not too hot. If it’s too hot wait a few minutes for it to cool down before pouring it over the cake.
If you need more frosting then collect the excess frosting and reheat it up and pour again. You can also use a spatula to spread a little extra frosting if there are any places that are a little thin.
LEGO-themed birthday party
To make it extra special, display it on a LEGO base plate and add a few Minifigures. I suggest placing a piece of parchment paper under the cake to keep things cleaner.
Are you for LEGO birthday party ideas? I have a post dedicated to easy LEGO party ideas include decorations, activities, and party favors. I hope it helps you plan an easy and fun lego-themed birthday party.
More LEGO Birthday Cakes
Don’t love my LEGO birthday cake idea? Don’t miss these other LEGO cakes and other LEGO dessert ideas that would be great for a LEGO birthday party.
Want to forgo a traditional birthday cake for your LEGO party? How about adorable LEGO head marshmallow pops? If you are looking for yummy and AMAZINGLY easy then LEGO brownies or LEGO Batman cookies are perfect.