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1
Use a potato masher to mash the butter, sugar, flour and bicarbonate of soda with the egg, bananas and essence together in a bowl till the mix has no lumps and is well mixed.
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2
Cut each square of chocolate into four then mix into the cake mix with sufficient lowfat milk to make a dropping consistency.
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3
Spread the mix in the prepared tin and bake in a moderate oven (180 C / 350 F / Gas Mark 4) for about 50 min till cooked through.
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4
Turn out and cold on a wire tray.
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5
Cut a 5cm (2 inch) wide slice off one short side of the cake.
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6
Assemble the cake on the board, propping up the cut slice with the Flake so which it stands at an angle to one of the short ends.
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7
Whisk the dessert topping with the lowfat milk till it holds its shape.
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8
Place two spoonfuls in the piping bag fitted with the plain writing pipe; add in the drinking chocolate to the remainder, stirring it in proportionately.
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9
Spread the chocolate mix proportionately all over the cake, including the sides.
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10
Pipe the figures and signs of a calculator on the Buttons with the plain topping mix and place them in position.
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11
Pipe a plain white line round the edge to complete the cake.
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12
NOTES : The birthday cake for the older child - place the candles strategically on the top.