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Cream together the butter and caster sugar in a large bowl.
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Beat two eggs in a jug, gradually add the egg and flour to the butter and sugar, alternating between the two (1/3 of the egg, mix, 1/3 of the flour, mix... etc) until all the egg and flour are well mixed in.
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Mash the banana with a fork and then mix into the cake batter.
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Put 6 cases in a cupcake tin, and fill with the cake batter. Place in an oven preheated to gas mark 5/190c for 15-20 mins until cooked.
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Once cooled, mix together the cinnamon and sugar and sprinkle on top of the cakes.