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Bake and decorate a marble fondant cake
Marbling is an art that’s used across a wide range of mediums. From canvas pictures, to diary covers and even makeup brushes. So why not add the effect to a cake? When you create a marbling effect, the result is always different and can never be fully predicted. The reveal of the result can make it even more fun to complete!

Follow my step by step guide below to create your very own stunning fondant marble cake. It makes a great centre piece at parties but you could also create it simply for the joy of making something beautiful!

Posted by Emily B. Published See Emily B.'s 7 projects »
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  • How to bake a decorative cake. Fondant Marble Cake - Step 1
    Step 1

    Pre-heat the oven to 170 degrees (fan).

    Grease 2 cake tins with butter and set to one side.

  • How to bake a decorative cake. Fondant Marble Cake - Step 2
    Step 2

    Whisk the butter and sugar together.

  • How to bake a decorative cake. Fondant Marble Cake - Step 3
    Step 3

    Add in the eggs and vanilla extract and whisk together.

  • How to bake a decorative cake. Fondant Marble Cake - Step 4
    Step 4

    Sift the flour and baking powder into the mixture.

  • How to bake a decorative cake. Fondant Marble Cake - Step 5
    Step 5

    Fold the flour into the mixture using a figure of 8 technique (this helps to keep the air in the mixture).

  • How to bake a decorative cake. Fondant Marble Cake - Step 6
    Step 6

    Split the mixture between to 2 cake tins and bake for 15-20 minutes (mine took 17 minutes).

  • How to bake a decorative cake. Fondant Marble Cake - Step 7
    Step 7

    Once the cake is cooked (check with a cake tester), allow to cool for approximately 1 hour.

  • How to bake a decorative cake. Fondant Marble Cake - Step 8
    Step 8

    Whilst the cake is cooling, make the buttercream.

    Whisk the butter for at least 5 minutes. Add the vanilla extract and whisk for another minute.

  • How to bake a decorative cake. Fondant Marble Cake - Step 9
    Step 9

    Sift the icing sugar and add to the whisked butter in stages.

    Whisk after adding each new batch of icing sugar.

  • How to bake a decorative cake. Fondant Marble Cake - Step 10
    Step 10

    Add 3 tbsp of milk. I recommend whisking each time you add 1 tbsp to check the consistency. It needs to be smooth yet firm.

  • How to bake a decorative cake. Fondant Marble Cake - Step 11
    Step 11

    Cut the tops off both cakes to give an even surface.

    Add the buttercream to the top of one cake and stick the other on top.

    Cover the top and the sides of the cake in buttercream, using a spatula to smooth the surface.

  • How to bake a decorative cake. Fondant Marble Cake - Step 12
    Step 12

    Put the cake in the fridge to cool.

    Whilst cooling knead the blue and white fondant separately to soften. This should only take a few minutes.

  • How to bake a decorative cake. Fondant Marble Cake - Step 13
    Step 13

    Press the 2 fondants together then split in 2 (making sure both colours are in each piece)and press together again. Repeat the process for a few minutes.

    This will start to create a marble effect

  • How to bake a decorative cake. Fondant Marble Cake - Step 14
    Step 14

    Sprinkle some icing sugar on a surface and rolling pin. Slowly roll the fondant out, turning after each roll (this helps to prevent sticking).

  • How to bake a decorative cake. Fondant Marble Cake - Step 15
    Step 15

    Using the rolling pin, pick up the fondant and place over the cake.

    Carefully pull the fondant away from the cake, then smooth down with your hand. Use a fondant smoothing tool if possible to get a really straight finish.

  • How to bake a decorative cake. Fondant Marble Cake - Step 16
    Step 16

    Once all the fondant is smooth on the cake, cut around the base to remove the excess fondant. I used a pizza slicer for this step and it worked perfectly!

  • How to bake a decorative cake. Fondant Marble Cake - Step 17
    Step 17

    Finished

    Your cake is now ready to enjoy.

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