Preheat the oven to 180℃/350F, 200℃/400F or Gas mark 6.
Beat the sugars with the butter until soft and fluffy.
In another bowl mix the cocoa and malted drink powder with ABOUT 5 tbsp of boiling water. Add it gradually, whisking and mixing until you have a smooth paste. You may need a little more or less depending on the brands you use. Be sure to mix out all lumps.
Add the eggs, flour and cocoa mixture to the butter mixture. Beat until smooth and totally combined.
Share the mixture out between three 7" cake tins, well buttered and lined with baking paper. Smooth out the tops and bake in the oven for 25 - 30 minutes.
Make your icing by combining the butter, icing sugar and a paste made with the cocoa, malted drink powder and JUST enough boiling water to make make the paste. (Be sure to mix out all lumps from the paste). Beat the icing really well, it will be very stiff and powdery at the start.
When the cakes are cooked, remove from the oven and allow to cool in the tin for 10 minutes. Remove from the tins and trim the tops off if needed.
Sandwich together with the icing and decorate with Maltesers.
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