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Preheat the oven to 180 oC
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Make up the plain and chocolate sponges in two separates bowl, as follows
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Cream the butter and sugar together for a couple of minutes until light and fluffy
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Add the eggs one at a time, beating well after each addition
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Add the flour, cocoa powder (for the chocolate sponge) and the food dye (into the plain sponge), xanthan gum, baking powder and almonds and beat well to combine
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Line two 8 inch round baking pans
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Place alternate spoonfuls of plain and chocolate mixture into the baking pans
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Swirl the mixture with a knife to create the marble effect
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Smooth out the top of the cakes with a spatula
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Place in the oven and bake for 20 minutes
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Remove the cakes from the oven and cake pans and allow to cool on a wire rack
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To make the buttercream beat the butter, cocoa powder and icing sugar together until light and fluffy
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Use the butter cream to sandwich the two cakes together
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Top with halloween decorations of your choice
