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Whole Cake Recipes

Rainbow Cake

8 slices
Easy
40
This cake is easy to make but looks really impressive and colourful. The kids will love getting involved!
Bright, bold and utterly delicious, our rainbow cake recipe is destined to become your go-to bake for every future birthday party! This simple yet super effective cake design is made up of a light vanilla sponge cake topped off with a generous helping of rich buttercream and decorated with Smart...
Ingredients
Preparation
For the Vanilla Sponge
165 g
Margarine
165 g
Caster Sugar
3
Medium Eggs (beaten)
5 ml
Dr. Oetker Madagascan Vanilla Extract (1 tsp)
170 g
Self-Raising Flour
Dr. Oetker Madagascan Vanilla Extract (1 tsp)
Dr. Oetker Vanilla Buttercream Style Icing (1 tub)
Hints
For a more chocolatey cake
To make a chocolate sponge, simply use 150g Self raising flour and 20g Dr. Oetker Cocoa Powder. 
Not enough smarties
Lay the smarties out onto the cake before you add the buttercream to ensure you have enough of each colour, if you do not have enough smarties, you can make a smaller smartie rainbow, start decorating further into the centre of the cake.
Prep:
40 min
1
For the Vanilla Sponge

Pre-heat the oven the 180°C/160°C/Gas mark 4. Grease and line a 8” round cake tin. Place the margarine and sugar into a large bowl and cream together until light and fluffy. 

2

Add the eggs and Vanilla Extract and beat together to form a smooth mixture – if the mixture begins to curdle add a spoonful of flour. Sift the flour on top and fold into the mixture until just combined.

3

Pour the mixture into the prepared cake tin and smooth the top. Bake in the oven for 30 – 35 minutes until lightly golden and when a skewer is inserted into the centre of cake it comes out clean. Leave the cake to cool in the tin for 15 minutes, then remove, and place on a cooling rack to cool completely. 

4
To Decorate

Once the cake has completely cooled, cut in half to create the rainbow shape. Spread a layer of buttercream onto one half of the sponge and then sandwich together with the other sponge.

5

Stand the cake on our cake board or serving plate so the cake looks like a rainbow. Cover the top and sides of the rainbow in a thin layer of buttercream.

6

Stick the smarties onto the front of the cake in a rainbow pattern.

7

With the remaining buttercream place in a piping bag a cut off the end to create a 1 cm hole. Pipe blobs of buttercream around the base of the rainbow to resemble clouds. 

8

Your rainbow cake is now ready to enjoy! 

Additional information
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Ingredients

For the Vanilla Sponge
165 gMargarine
165 gCaster Sugar
3Medium Eggs (beaten)
5 mlDr. Oetker Madagascan Vanilla Extract (1 tsp)
170 gSelf-Raising Flour
To Decorate
400 gDr. Oetker Vanilla Buttercream Style Icing (1 tub)
118 gSmarties
Picture - Dr. Oetker Madagascan Vanilla Extract (1 tsp)
Picture - Dr. Oetker Vanilla Buttercream Style Icing (1 tub)
1

For the Vanilla Sponge

Pre-heat the oven the 180°C/160°C/Gas mark 4. Grease and line a 8” round cake tin. Place the margarine and sugar into a large bowl and cream together until light and fluffy. 

2

Add the eggs and Vanilla Extract and beat together to form a smooth mixture – if the mixture begins to curdle add a spoonful of flour. Sift the flour on top and fold into the mixture until just combined.

3

Pour the mixture into the prepared cake tin and smooth the top. Bake in the oven for 30 – 35 minutes until lightly golden and when a skewer is inserted into the centre of cake it comes out clean. Leave the cake to cool in the tin for 15 minutes, then remove, and place on a cooling rack to cool completely. 

4

To Decorate

Once the cake has completely cooled, cut in half to create the rainbow shape. Spread a layer of buttercream onto one half of the sponge and then sandwich together with the other sponge.

5

Stand the cake on our cake board or serving plate so the cake looks like a rainbow. Cover the top and sides of the rainbow in a thin layer of buttercream.

6

Stick the smarties onto the front of the cake in a rainbow pattern.

7

With the remaining buttercream place in a piping bag a cut off the end to create a 1 cm hole. Pipe blobs of buttercream around the base of the rainbow to resemble clouds. 

8

Your rainbow cake is now ready to enjoy!