In order to make A Building Block Birthday Cake, you will need the following: a 13 x 9‚Äù cake, marshmallows, scissors (pre-treated with nonstick cooking spray), and bright colored frosting.
Remove the top of the cake, by cutting it off. Next, flip the cake over. Then, cut the cake into 3 equal sized cakes. Cut one of the blocks in half. Crumb coat the cake. Cut the marshmallows in half. Insert a fork into the side of the marshmallow. Ice the marshmallow. Place the marshmallows on the cake. You can cut the cake into slices that correspond to any type of Lego building block. The marshmallows that you use as plugs should correspond with the number that Lego blocks would have on them: i.e. 2, 4, or 8 typically.