What’s better than a sponge cake? A sponge cake with all the colours of the rainbow!! Well 5 colours anyway. This cake takes a basic sponge mix and pimps it right up. It’s perfect when you want to keep things simple but make something a little bit different. This cake was made using the Wilton Easy layer cake pan set and the Wilton food colouring pack.

Ingredients
200g self raising gluten free flour
1 tablespoon xanthan gum
200g golden caster sugar
175g unsalted butter at room temperature
3 eggs beaten
1 tablespoon milk
5 food colourings

To decorate
300g softened unsalted butter
600g icing sugar
4 tablespoons of milk
food colourings in the colours of your choice

Grease the cake tins and preheat the oven to 150C.

I prefer the all in one method for sponges so I add all the ingredients into a food processor and mix until well combined.

Divide your mix into 5 bowls, in each bowl add a couple of drops of the colour you want for that layer. Mix well until the mix is a uniform colour.

Put the mix into the tin and bake for about 15 minutes. Remove from the oven when the cake starts to come away from the sides.

Allow to cool.

In the meantime, to make your buttercream icing, add the butter to a food processor and slowly add the icing sugar, after you have added about half the icing sugar, add half the milk. Continue adding the icing sugar and the milk.

I wanted an ombre effect on the cake, so divide your buttercream in half. One half will be for the filling and top, the other for the sides.

When the cake has cooled, spread butter cream throughout the layers and on top.

Add a couple of drops of food colouring to the remaining butter cream and mix well. Spread half of this mixture all around the sides of the cake. Add a couple more drops of food colouring to the remaining buttercream and spread half of this 2 thirds of the way up the cake.

With the remaining butter cream, add a further 1 or 2 drops of food colouring, mix well and spread across the bottom third of the cake.