Spongebob Cake - cooking recipe

Ingredients

1 (8 ounce) box cake mix (i used chocolate)
for cream
500 ml milk
sugar, by taste
4 tablespoons flour
5 egg yolks
3 tablespoons cocoa
100 g unsalted almonds
for buttercream
200 g butter
100 g caster sugar
3 tablespoons of classic caramel ice cream topping
for decoration
fondant
food coloring

Preparation

bake cake mix in a rectangular pan.
once they are baked let them cool down.
then cut it in half to make 2 pieces (cut with thread).
mix all ingredients for cream.
boil them on a low fire until thickening.
let it cool down.
once everything is dry put a layer of cake and then a layer of cream and the almonds and the second cake piece on top.
put it in the refrigerator for a few hours.
after it has been in the fridge for a few hours prepare the buttercream.
mix the butter with a mixer and slowly add caster sugar to it until it is nice and fluffy.
once it is nice and fluffy add the caramel to it.
once the buttercream is done spread it all over the top and sides of the cake.
leave it in the fridge for a few hours.
once its done you must decorate it with the colored fondant, make sure to make it look like spongebob.