My son wanted a Captain Underpants cake for his birthday. I actually found the idea from the coolest-birthday-cakes website and tweaked it a bit to work for us.
Making the Captain Underpants Cake
We made a 9 x 13 chocolate sheet cake and decorated it with homemade butter cream frosting. The recipe for the frosting is 2 sticks butter, 4 cups powdered sugar, 1 tsp vanilla, and 3 T milk. We reserved about 1/4 cup of plain frosting for the teeth and underwear. For the skin, we dyed 1/2 cup of it light pink. We dyed the rest of the frosting blue. Also, we used some premade red and black frosting in a tube for the outlining and cape.
The Buttercream Transfer
We printed out a coloring page image of Captain Underpants which we found via internet search (if you want to do an image with words, you will need to print out a mirror image of the picture). Then, I placed the coloring sheet on a hard wood board and covered it with a piece of waxed paper, which was taped in place. Next I used black tube frosting and a piping tip to trace the outline of the image. Then we piped in the white for the teeth and underwear, pink for the skin, red for the cape.
I covered the image with another sheet of wax paper and put the whole board in the freezer for an hour. Meanwhile, I frosted the cake with the blue frosting. After the butter cream image was completely hardened in the freezer, I removed it and slowly took off the top layer of wax paper. Then I flipped the butter cream image onto the cake. Then we SLOWLY peeled off the wax paper and smoothed over any rough spots on the image with a finger dipped in water. For the finishing touches, we just used a star tip to add a border and candy letters.
Thank you to Amanda S. for giving me the idea! My son loved it!
Thanks for this great tip! This is the cake my son has asked for and I an NO artist….. I was wondering how I would get it all to come out. Thanks for the great tip!!