Slice bananas into thin slices.

Grab two slices of bread and spread Nutella over one slice and Mascarpone over the other slice.

Place banana slices over one of the slices and put both the slices together in a sandwich.

Beat the eggs and add some sugar to it (make sure you don't add too much sugar, Nutella and bananas already add sweetness to the sandwiches).

Cut the sandwiches into triangles and dip the triangles in the beaten eggs and fry the them in some oil or butter in a fry pan just like you would fry a regular French Toast.

Eat hot or cold. You could also sprinkle some icing sugar over the sandwich triangles or decorate them with banana slices or other fruits.