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Preheat the oven to Gas Mark 4, 180 c. Grease and line a square cake tin 21cm x 21cm.
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In a bowl, beat together the butter and sugar until light and fluffy. Add the eggs one at a time, beating well after each addition. Add the sifted flour, baking powder and cocoa and fold in.
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Put half the mixture into the greased cake tin. Bake for around 20 minutes (test with a skewer, it should come out clean if cake is cooked).
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Once baked, leave cake to fully cool in the tin then place your Milk Tray chocolates on the cake, in the same order as they were in the box and pipe the rest of the mixture in between them.