Finding Nemo Cake

I think this is my favorite cake I've done to date. It was tons of work but it
turned out great! For two weeks leading up to the cake, I made the Finding Nemo characters out of fondant. I loved the decorations for this cake even without the actual cake!

The bottom tier of the cake was PBCB (peanut butter-chocolate-banana) cake iced in a milk chocolate-peanut butter buttercream and covered with a lightly peanut butter-flavored marshmallow fondant. The frosting that went with this recipe was a disaster and had to be thrown out so I made this recipe up to go with it and it was really good.

The top tier was a sour cream chocolate cake with an Oreo buttercream covered in a chocolate-flavored marshmallow fondant. I've been wanting to try an Oreo cookies n' creme type buttercream for awhile and thought a 3 year old's birthday party was the perfect occasion to do so!