Bake a sheet cake the size that you need.
Cut a 1/8 inch deep line down the center of the cake lengthwise. On the
side of the cake that you will be putting your characters on, cut the
cake out from the 1/8 inch cut slating it up towards the top edge.
Now ice
the cake in white icing and let it set and dry about 20
minutes.
Round the top edge of the cake.
Using a blue food color spray (also known as color mist) spray the top
and the sides of the cake.
Using white icing and basketweave tip, size #45, make
ines for the
background starting at your 1/8 inch cut and angling out towards the
top.
With an icing filled bag, draw Superman in the center, Wonder Girl and
Hulk on one side and Batman and Spiderman on the other side.
Use star tip, size #14 to fill in all of the areas of
the characters
with the proper colors for each.
Use black icing and round tip, size #3 to do all of the outline work on
all of the characters.
Use white icing and star tip, size #18 to make a
shell border at the bottom of the sides of the cake.
Change the tip to a round tip size #5 and write the birthday message on the bottom half of the cake top under the Justice League Characters.