425g/15oz very ripe bananas, peeled (about 3 large or 4 small bananas)
1 banana, sliced in half
1ΒΌ tsp baking powder
1ΒΌ tsp bicarbonate of soda
250g/9oz dark brown sugar
2 tbsp light brown sugar
1 tbsp caster sugar
ΒΎ tsp ground cinnamon
1 tsp cornflour
100²µ/3Β½΄Η³ϊ icing sugar, sifted
60²µ/2ΒΌ΄Η³ϊ raisins
1Β½ tsp salt
280g/10oz white spelt flour
1Β½ tsp vanilla extract
180ml/6fl oz vegetable oil, plus extra for greasing
dark chocolate, for grating
200g/7oz full-fat cream cheese
75ml/2Β½fl oz (5 tbsp) double cream
3 free-range eggs
120ml/4fl oz natural yoghurt