Step 1: Preheat oven to 170C, fan forced (190C conventional).
Step 2: Combine two of the bananas, chickpeas, sour cream, olive oil, sugar, eggs and cocoa powder in the bowl of a food processor or blender and puree until smooth.
Step 3: Sift in flour, bicarb and spices, then pulse until smooth.
Step 4: Spoon into two medium loaf tines, lined with baking paper.
Step 5: Peel remaining banana and slice lengthways into four slices and arrange on top and then bake for 40 to 45 minutes, until testing skewer comes out clean.
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