Mince the chicken breasts, trimmed of fat and skin, in a food processor.

NextPut the onion in a frying pan with a splash of oil and, when it's fairly soft, add the sliced portobello mushrooms and let them cook in the oil and their own juices until caramelised.

Put the onion in a frying pan with a splash of oil and, when it's fairly soft, add the sliced portobello mushrooms and let them cook in the oil and their own juices until caramelised.

NextLet the onion and mushrooms cool a little and chop them in the food processor.

Season the minced chicken with salt, onion powder, garlic powder and pepper and mix well.

NextAdd the cassava flour and mix again

Add the cassava flour and mix again

NextAdd the onion and mushroom mixture and the Parmesan

Add the onion and mushroom mixture and the Parmesan

NextShape the burgers like hands and cook them in a frying pan with a few drops of oil.

Shape the burgers like hands and cook them in a frying pan with a few drops of oil.