Line the base of a 20 x 20cm baking tin with baking parchment. Put the seeds in a dry, non-stick pan over a medium heat and cook until they start to pop and turn golden. Transfer to a small bowl to cool.
In a medium saucepan, soften the nut butter and honey over a low heat for about 2 mins, stirring continuously, until the mixture has warmed through.
Take the pan off the heat. Stir in the cinnamon and cocoa powder, followed by the fruit and toasted seeds. Add the puffed rice and stir well to coat. Quickly transfer the mixture to the tin, spreading out evenly and pressing down with the back of a spoon to create a compact, even surface.
Leave for 45 mins-1 hr to firm up, then slice into 8 bars with a sharp knife. Wrap in strips of baking parchment and secure with tape or string. Will keep in an airtight container for 3-4 days.