I just recently did this cake for my son’s best friend’s birthday. He was turning 5 and both him and my son love Legos, Starwars and Batman. So we just kind of put them all into one cake. The Rainbow cake was just a suggestion from the birthday boy’s mom but was a great suprise at the birthday party. My son is turning 6 in May and I have a feeling I will be trying out the lego cakes again.

To make the cakes, I used a rectangle loaf pan. I made marshmallow fondant to cover the cakes as well as to make the circular lego connectors on the tops. If you have never used homemade marshmallow fondant, it is very easy to make as well as work with and color. Here is the recipe if you would like it:

Ingredients: 21 ounces mini white marshmallows (2 -10.5 ounce bags), 1/2 cup butter, 2 pounds confectioner sugar and 1-3 tbsp water.

I usually heat the butter on the stove top till melted and then add the marshmallows like making rice crispy treats (make sure to keep stirring or the mixture will burn). Then I add half the confectioner sugar to the bottom of an electric mixing bowl. Pour the melted mixture over the sugar and add the remaining confectioner sugar on top. Start the mixer slowly (to avoid a snow storm in your kitchen)  and increase the speed as needed adding the water one Tbsp at a time till desired consistency reached.

*I like to make a half a batch at a time and once the marshmallows are all melted this is when I color or add flavoring (the color and flavoring are more consistently spread). You can do a whole batch with the coloring and flavoring if you are needing to cover a large cake or making several things that color.

*I have found that is also helpful to use some a flavored gelatin to start the coloring process and to add flavor to the fondant. For the red fondant on the Lego cakes, I added strawberry gelatin to the melted marshmallow mixture with a small amount of red food dye. The color was rich and it was very tasty.

This was a fun cake to make and the kids really loved it.