Combine flour, baking powder, salt and sugar in a bowl.
Add vanilla extract and oil.
Add water to the batter until consistent. Make sure it should be not too thick nor too thin.
Add mashed bananas in the batter.
Melt the butter in the microwave oven or put it directly in the griddle. After the butter melts, with the help of a big bowl or a big spoon, pour the batter on the griddle. Cook until bubbles appear on the surface.