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Chocolate Peppermint Spongebob Cake

Tutorial on how to make 3-D cake!


  • one square OSB
  • a small rectangular OSB
  • steel floor flange
  • bolts
  • dowels
  • aluminum foil
  • fondant
  • food coloring


Cake (double the recipe!)

  • 2 1/2 c flour
  • 2 c sugar
  • 2 tsp Bsoda
  • a pinch or two salt
  • 6 tbsp cocoa powder
  • 1/2 c vegetable oil
  • 1 tsp peppermint extract
  • 1/2 tsp vanilla essence
  • 2 tbsp vinegar
  • 2 c water

Choc Peppermint Buttercream

  • 5 egg whites
  • 1 1/4 c sugar
  • 1 lbs unsalted butter
  • 2-3 tbsp cocoa powder
  • 1 - 1 1/2 tsp peppermint extract



  • In a large bowl, mix flour, sugar, baking soda, salt and cocoa powder
  • In a separate bowl, mix oil, essence and extract, plus water
  • Pour oil mixture into flour mixture and add in vinegar
  • Mix to combine well
  • Pour batter into greased and lined with parchment paper baking pan, bake for 30-35 mins at preheated 350 F
  • Cool on rack


  • In a double boiler, heat egg whites and sugar until 160 F, making sure water isn't fully boiled, just simmer. Stirring occasionally.
  • Beat egg whites in low speed over a stand-up mixer, until cool to room temperature. Once egg white is room temperature, bring up speed to high until firm peak forms
  • Beat in butter a little at a time, keep beating until creamy
  • Once creamy beat in cocoa powder, followed with extract

Spongebob Cake

  • Pipe some cream on a cake and stack. Each time, pipe some cream before stacking. Cover the whole cake with buttercream. Insert two big skewers on cakes for extra strengtheners. So you would have middle dowel plus two big skewers.
  • Roll flat a yellow fondant, about 18 inch in size (I use The Mat to roll my fondant and it has measurement, so 18 inch on all sides. This is enough to cover my overall cake, sides and front), and cover your cake.
  • You can either stack the cakes right away onto the OSB body (pushing through the dowel) or you can cover the cake first then lift it up and push it onto the dowel. Whichever you find it to be easier.
  • Roll more yellow fondant, enough to cover the back of Spongebob.
  • Start decorating as Spongebob (make indents for the sponge with ball tool or even spoon)
  • Roll flat white fondant and cut into two rounds for eyes, red fondant for mouth, pink fondant for tongue. Cut white fondant into small strips for teeth, blue fondant for eyes, black fondant for lashes, etc.
  • Now to make the hands (which later my 7 yo protested why Spongebob only has 3 fingers, I honestly didn't know that he had 5 fingers like humans do hahaha). Roll two white fondants and two yellow ropes. Attach white and yellow with skewer and flatten the end of the yellow and shape into fingers.
  • For the nose, shape a yellow fondant into a somewhat rope and insert skewer.
  • Glue all fondant for eyes etc with a dab of water. While for hands and nose, push in the skewers into the cake
  • Voila, your stand-up Spongebob cake is done ^_^
  • Oh don't forget for the pants area, either paint white fondant with brown food color or attach premade brown fondant. And also make red tie :)