Separate egg whites from the yolks and put the whites in a bowl. Add 4 tsps sugar and beat well.
Heat oil in a non-stick pan.
Peel and cut bananas into roundels.
Heat butter in another non-stick pan. Add banana roundels, remaining sugar and cook till the bananas caramelize.
Crush cornflakes and spread on a plate.
Dip brown bread slices in the beaten egg whites and coat in the cornflakes. Place in the oil and shallow-fry till evenly golden from both sides.
Cut French toasts into triangles and serve immediately with the caramelized bananas.