I used two box cake mixes to create a two-layer cake and chopped the tops layer using dental floss (to flatten). I didn’t have a lot of time to create an elaborate cake (my son’s birthday falls on Thanksgiving weekend), so I also bought 3 containers of white frosting and Wilton black gel to outline.
The Wow Wow Wubbzy Birthday Cake was frosted white, then I drew Wubbzy with a toothpick, filled with yellow frosting and outlined. I used a pastry bag for the blue cake outline.
Pretty easy and my 2-year old son loved it!