Cake: Bake 2 9 x 13 rectangle cakes and cool completely. Stack them on top of one another with icing in the middle. Cut the corners of the cakes off to form an oval. Roll out yellow marshmallow fondant to be 17 x 21 at least and cover cake. Cut around edges with pizza cutter. Take a batch of black marshmallow fondant and mold freehand into bat shape or roll out and then cut out a bat figure.
Goodie bags: I made these capes as a take-home gift in place of goodie bags. The kids painted the emblem on at the party. I made the capes out of felt that I got on clearance towards the end of winter. No need to finish edges. I purchased velcro squares and sewed them on the neck straps. Very easy.
I made a template out of a cereal box to paint the emblem on at the party. I found a logo I liked online and printed it out and used it to trace onto the cardboard. I then cut into the cardboard only in the yellow part of the logo and cut the logo out so that I had a rectangular piece of cardboard with an oval cut out and a cardboard bat that fit inside it. I just taped the cardboard down onto the felt where I wanted the batman design. The kids painted the capes with paintbrushes dipped in yellow fabric paint. When the kids were finished, I just removed the cardboard. Let dry before using :)
Food and Drink: Lemonade is yellow (perfect!) I made sugar cookies and used marshmallow fondant to cut out yellow circles and black bats to form the batman emblem.
Invitations: I used evite which is free and you can even design your own invitation. I chose a dark background and then added batman images I found online.