Rainbow Layer Cake

Name: Rainbow Layer Cake
Prep time: 45 min
Cook time: 15 min
Yield: 20
Ingredients: 225 g caster sugar; 840 g icing sugar; 225 g self-raising flour; 225 g margarine; 2 tsp vanilla extract or vanilla bean paste; 2 tsp baking powder; 420 g unsalted butter; 4 large eggs; 4-6 tbsp milk

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Unassuming and simple from the outside, but when it's cut into this Rainbow Layer Cake has the most amazing layers of colour. This cake really does have the wow factor!

By: Curlyscooking (via Curlyscooking)

Last Updated: Mar 1, 2026

Prep: 45 mins

Cook: 15 mins

Yields: 20

Ingredients

225 g caster sugar
840 g icing sugar
225 g self-raising flour
225 g margarine
2 tsp vanilla extract or vanilla bean paste
2 tsp baking powder
420 g unsalted butter
4 large eggs
4-6 tbsp milk

Instructions

Preheat the oven to 160°C (fan assisted, 180°C non fan). Line your 6″ cake pans
Add the butter and sugar to your bowl and cream until light and fluffy
Add the eggs one at a time starting on a low speed and increasing it after each egg has been added. Add the vanilla and mix again before finally adding the flour and baking powder
Split the cake mix equally into 5 different bowls. Add a different colour of gel food colouring to each bowl
Pour each bowl of coloured cake mix into your prepared tins and bake in the oven for 10-15 minutes. They’re done when a cocktail stick comes out clean
Allow the cakes to cool slightly in the pans before turning out onto a wire rack and let them cool completely
Once completely cooled, level the cakes if needed so that they stack more evenly. You’re looking to take the smallest amount of cake off to make the cake flat
Mix the butter and icing sugar together until pale and smooth. Add enough milk until it is a smooth spreadable consistency
Starting with the blue layer, place one layer onto your cake board and then add a generous layer of buttercream. Repeat with all 5 layers