Blend the bananas in a food processor.
Add the banana mash to a bowl with the remaining ingredients. Work all into a compact and sticky dough.
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{{/ items}} {{^ items}} {{/ items}}Transfer the puffed rice mixture into a tin lined with baking paper. Flatten and compact the mixture pressing down with the back of a spoon.
Refrigerate the puffed rice slab for 20 minutes and then slice it into bars.