Add dry ingredients well (flour, salt, vanilla sugar, sweetener). Pour in milk, only as needed (1/2 cup or less), mix well, until all dry ingredients dissolved
Add in vanilla extract, marshmallow, egg, mix well
Add in mashed banana/banana slices, mix well
Heat pan, brush with a little oil, pour batter, fry until golden brown, on lower-medium heat
Give a little touch of chocolate rice or raisins or grated cheese on top of cake