Place the onion in a bowl, add the crumbled feta, mint, breadcrumbs and chickpea flour. Add the egg, season to taste, and bind together, chill the mix for 30 minutes, then shape into 8 small fairly flat shaped burgers.
Heat a film of oil in a nonstick frying pan, add the burgers and fry gently for 3-4 minutes on each side, remove and keep them warm.